Build / Deployment Vaadin25 fails

OnDemand · January 16, 2026, 8:00am

Hi there,

i switched to v25 but when i build with my old pom and deploy it, i get the following error during startup at server:Running project in development mode with no access to folder ‘C:.…’.

Looks like it tries to start in devmode.

I have build with mvn clean package, but i think i have an error in my pom. Does some one has an idea whats missing or is wrong? I need to clean this up i think, there are probably some plugins etc which are not necassary.

  </dependencies>

    <build>
        <finalName>portal</finalName>
        <defaultGoal>spring-boot:run</defaultGoal>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

            <plugin>
                <groupId>com.vaadin</groupId>
                <artifactId>vaadin-maven-plugin</artifactId>
                <version>${vaadin.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>prepare-frontend</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

    <profiles>
        <profile>
            <!-- Production mode is activated using -Pproduction -->
            <id>production</id>
            <dependencies>
                <!-- Exclude development dependencies from production -->
                <dependency>
                    <groupId>com.vaadin</groupId>
                    <artifactId>vaadin-core</artifactId>
                    <version>${vaadin.version}</version>
                    <exclusions>
                        <exclusion>
                            <groupId>com.vaadin</groupId>
                            <artifactId>vaadin-dev</artifactId>
                        </exclusion>
                        <exclusion>
                            <groupId>com.vaadin</groupId>
                            <artifactId>vaadin-dev-server</artifactId>
                        </exclusion>
                        <exclusion>
                            <groupId>com.vaadin</groupId>
                            <artifactId>hilla-dev</artifactId>
                        </exclusion>
                    </exclusions>
                </dependency>
            </dependencies>
            <build>
                <plugins>
                    <plugin>
                        <groupId>com.vaadin</groupId>
                        <artifactId>vaadin-maven-plugin</artifactId>
                        <version>${vaadin.version}</version>
                        <executions>
                            <execution>
                                <goals>
                                    <goal>build-frontend</goal>
                                </goals>
                                <phase>compile</phase>
                                <configuration>
                                    <forceProductionBuild>true</forceProductionBuild>
                                    <optimizeBundle>false</optimizeBundle>
                                </configuration>
                            </execution>
                        </executions>
                    </plugin>
                    <!-- Spring Boot Repackage -->
                    <plugin>
                        <groupId>org.springframework.boot</groupId>
                        <artifactId>spring-boot-maven-plugin</artifactId>
                        <executions>
                            <execution>
                                <id>repackage</id>
                                <goals>
                                    <goal>repackage</goal>
                                </goals>
                            </execution>
                        </executions>
                    </plugin>
                </plugins>
            </build>
        </profile>
    </profiles>

marcoc_753 · January 16, 2026, 8:27am

Can you share the build logs?

Just a couple of notes:

Since Vaadin 25, dev dependencies are excluded by default, and you need to configure them as optional (How to upgrade Vaadin applications)
The Maven package is intended to build a production artifact without the need for a dedicated profile. Just configure the build-frontend goal execution for the Vaadin Maven plugin in the main build section (in your example basically replace prepare-frontend with build-frontend) How to create a production build in Vaadin Flow

OnDemand · January 16, 2026, 10:07am

I have changed it to build-frontend but still get an error see below

Summary

Failed to execute goal com.vaadin:vaadin-maven-plugin:25.0.3:build-frontend (default) on project webapp: null: MojoFailureException: InvocationTargetException: Could not execute build-frontend goal: Error occured during goal execution: nullPlease run Maven with the -e switch (or Gradle with the --stacktrace switch), to learn the full stack trace. StackOverflowError → [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal com.vaadin:vaadin-maven-plugin:25.0.3:build-frontend (default) on project webapp: null
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:333)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000 (MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run (MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute (DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:159)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:105)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:73)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:53)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:118)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:261)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:906)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:283)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:206)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:103)
at java.lang.reflect.Method.invoke (Method.java:580)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:255)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:201)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:361)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:314)
Caused by: org.apache.maven.plugin.MojoFailureException
at com.vaadin.flow.plugin.maven.FlowModeAbstractMojo.execute (FlowModeAbstractMojo.java:359)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:126)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:328)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000 (MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run (MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute (DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:159)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:105)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:73)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:53)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:118)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:261)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:906)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:283)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:206)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:103)
at java.lang.reflect.Method.invoke (Method.java:580)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:255)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:201)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:361)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:314)
Caused by: java.lang.reflect.InvocationTargetException
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:118)
at java.lang.reflect.Method.invoke (Method.java:580)
at com.vaadin.flow.plugin.maven.FlowModeAbstractMojo.execute (FlowModeAbstractMojo.java:352)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:126)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:328)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000 (MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run (MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute (DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:159)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:105)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:73)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:53)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:118)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:261)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:906)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:283)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:206)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:103)
at java.lang.reflect.Method.invoke (Method.java:580)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:255)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:201)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:361)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:314)
Caused by: org.apache.maven.plugin.MojoFailureException: Could not execute build-frontend goal
at com.vaadin.flow.plugin.maven.BuildFrontendMojo.executeInternal (BuildFrontendMojo.java:181)
at com.vaadin.hilla.maven.BuildFrontendMojo.executeInternal (BuildFrontendMojo.java:85)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:103)
at java.lang.reflect.Method.invoke (Method.java:580)
at com.vaadin.flow.plugin.maven.FlowModeAbstractMojo.execute (FlowModeAbstractMojo.java:352)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:126)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:328)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000 (MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run (MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute (DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:159)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:105)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:73)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:53)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:118)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:261)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:906)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:283)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:206)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:103)
at java.lang.reflect.Method.invoke (Method.java:580)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:255)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:201)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:361)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:314)
Caused by: com.vaadin.flow.server.frontend.ExecutionFailedException: Error occured during goal execution: nullPlease run Maven with the -e switch (or Gradle with the --stacktrace switch), to learn the full stack trace.
at com.vaadin.flow.plugin.base.BuildFrontendUtil.runNodeUpdater (BuildFrontendUtil.java:388)
at com.vaadin.flow.plugin.maven.BuildFrontendMojo.executeInternal (BuildFrontendMojo.java:179)
at com.vaadin.hilla.maven.BuildFrontendMojo.executeInternal (BuildFrontendMojo.java:85)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:103)
at java.lang.reflect.Method.invoke (Method.java:580)
at com.vaadin.flow.plugin.maven.FlowModeAbstractMojo.execute (FlowModeAbstractMojo.java:352)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:126)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2 (MojoExecutor.java:328)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute (MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000 (MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run (MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute (DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:159)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:105)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:73)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:53)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:118)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:261)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:173)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:101)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:906)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:283)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:206)
at jdk.internal.reflect.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:103)
at java.lang.reflect.Method.invoke (Method.java:580)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:255)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:201)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:361)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:314)
Caused by: java.lang.StackOverflowError
at java.lang.StringUTF16$CharsSpliterator.tryAdvance (StringUTF16.java:1228)
at java.util.stream.IntPipeline.forEachWithCancel (IntPipeline.java:163)
at java.util.stream.AbstractPipeline.copyIntoWithCancel (AbstractPipeline.java:527)
at java.util.stream.AbstractPipeline.copyInto (AbstractPipeline.java:513)
at java.util.stream.AbstractPipeline.wrapAndCopyInto (AbstractPipeline.java:499)
at java.util.stream.FindOps$FindOp.evaluateSequential (FindOps.java:150)
at java.util.stream.AbstractPipeline.evaluate (AbstractPipeline.java:234)
at java.util.stream.IntPipeline.findFirst (IntPipeline.java:552)
at java.text.DecimalFormatSymbols.findNonFormatChar (DecimalFormatSymbols.java:854)
at java.text.DecimalFormatSymbols.initialize (DecimalFormatSymbols.java:833)
at java.text.DecimalFormatSymbols. (DecimalFormatSymbols.java:115)
at sun.util.locale.provider.DecimalFormatSymbolsProviderImpl.getInstance (DecimalFormatSymbolsProviderImpl.java:85)
at java.text.DecimalFormatSymbols.getInstance (DecimalFormatSymbols.java:183)
at sun.util.locale.provider.NumberFormatProviderImpl.getInstance (NumberFormatProviderImpl.java:185)
at sun.util.locale.provider.NumberFormatProviderImpl.getNumberInstance (NumberFormatProviderImpl.java:151)
at java.text.NumberFormat.getInstance (NumberFormat.java:979)
at java.text.NumberFormat.getInstance (NumberFormat.java:965)
at java.text.NumberFormat.getNumberInstance (NumberFormat.java:518)
at java.util.Scanner.useLocale (Scanner.java:1278)
at java.util.Scanner. (Scanner.java:547)
at java.util.Scanner. (Scanner.java:773)
at com.vaadin.flow.internal.StringUtil.removeComments (StringUtil.java:100)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:207)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)
at com.vaadin.flow.server.frontend.CssBundler.inlineImports (CssBundler.java:210)
at com.vaadin.flow.server.frontend.CssBundler.lambda$inlineImports$0 (CssBundler.java:228)
at java.util.regex.Matcher.replaceAll (Matcher.java:1304)

The problem was, that i had a reference of a file itself

so a file like my.css i had @import(/mycss.css)

that stopped the build process.

But now my theme doesnt get loaded. In console i see that lumo.css cant be found (404) looks like a Spring security blocking. I am testing whats going on

marcoc_753 · January 16, 2026, 10:20am

If it’s 404 is it not Spring Security that blocks; it would be a 401 or 403.
Can you show how you load the Lumo css?

marcoc_753 · January 16, 2026, 10:24am

Also, can you please share the structure of your CSS?
Based on the stack trace, it seems there’s an infinite loop while resolving CSS imports.
Could it be that you have cyclic references in your CSS?
Anyway, this is something that Flow should detect and avoid. It may deserve a ticket on the Fow GH repo if you can provide a reproducer.

OnDemand · January 16, 2026, 11:00am

i have now added /lumo/** into vaadinSecurityFilterChain and the 404 disappeared and the Page looks like it should.

   private static final String[] PUBLIC_ENDPOINTS = {
            "/images/**", "/img/**", "/fonts/**", "/css/**", "/js/**",
            "/font-awesome/**", "/favicon.ico", "/robots.txt", "/error",
            "/VAADIN/**",
            "/styles.css",
            "/lumo/**",
            "/?v-r=heartbeat*"
    };

....

http.authorizeHttpRequests(auth -> auth
                        .requestMatchers(Arrays.stream(PUBLIC_ENDPOINTS)
                                .map(path -> PathPatternRequestMatcher.withDefaults().matcher(HttpMethod.GET, path))
                                .toArray(PathPatternRequestMatcher[]::new)).permitAll()
....

Regarding the cycle i think it can be reproduced if you add

into a css file an import to its own. For example

style.css
@import (‘./components/vaadin-upload.css’);

and in this vaadin-upload.css you also
@import url(‘./components/vaadin-upload.css’);
so this file imports itself

marcoc_753 · January 16, 2026, 11:14am

Side question: Aren’t you using VaadinSecurityConfigurer? It handles Lumo path by default?

OnDemand · January 16, 2026, 11:18am

Not yet. Because the App is stateless currently (will be changed in the future)

marcoc_753 · January 16, 2026, 11:20am

Sure, but I wanted to see the real use case that caused the loop, just to be sure if it was a valid css

OnDemand · January 16, 2026, 11:25am

Sorry dont get it, what excatly you need. The error dissapperared as soon as i removed the import @import url(‘./components/vaadin-upload.css’); in the file ‘./components/vaadin-upload.css’

That was not an intent to have the import in its own file

marcoc_753 · January 16, 2026, 4:26pm

For the record, even though this is mostly a project issue, I created a GH ticket Infinite loop in CSSBundler when stylesheets mistakenly have cyclic imports · Issue #23237 · vaadin/flow · GitHub.