Andreas135
September 19, 2018, 9:50am
1
During the maven build I get this error message
[INFO]
--- flow-maven-plugin:1.0.5:copy-production-files (default) ---
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
I have already added slf4j-simple to my pom. At the moment no logging messages appear at the server since the logger implementation is defaulted to the NOP logger.
How can I enable logging on the server?
alejandro.du
September 19, 2018, 9:55am
2
Can you share your pom.xml file?
Andreas135
September 19, 2018, 11:02am
3
here it is. confidential information has been replaced by —
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>---</groupId>
<artifactId>---</artifactId>
<name>---</name>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<failOnMissingWebXml>false</failOnMissingWebXml>
<vaadin.version>10.0.5</vaadin.version>
<flow.maven.plugin.version>1.0.5</flow.maven.plugin.version>
<jetty.version>9.3.7.v20160115</jetty.version>
</properties>
<pluginRepositories>
<pluginRepository>
<id>vaadin-prereleases</id>
<url>https://maven.vaadin.com/vaadin-prereleases</url>
</pluginRepository>
</pluginRepositories>
<repositories>
<repository>
<id>nexus</id>
<url>---</url>
</repository>
<repository>
<id>vaadin-addons</id>
<url>http://maven.vaadin.com/vaadin-addons</url>
</repository>
<repository>
<id>webjars</id>
<url>https://dl.bintray.com/webjars/maven</url>
</repository>
<repository>
<id>vaadin-prereleases</id>
<url>https://maven.vaadin.com/vaadin-prereleases</url>
</repository>
</repositories>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-bom</artifactId>
<type>pom</type>
<scope>import</scope>
<version>${vaadin.version}</version>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-core</artifactId>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-simple</artifactId>
<version>1.7.25</version>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
<version>1.9.2</version>
<type>jar</type>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>eclipselink</artifactId>
<version>2.7.0</version>
<exclusions>
<exclusion>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.1.1</version>
</dependency>
<dependency>
<groupId>postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.1-901-1.jdbc4</version>
</dependency>
<dependency>
<groupId>javax.mail</groupId>
<artifactId>javax.mail-api</artifactId>
<version>1.6.2</version>
</dependency>
<dependency>
<groupId>com.sun.mail</groupId>
<artifactId>smtp</artifactId>
<version>1.6.2</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>${jetty.version}</version>
</plugin>
</plugins>
</build>
<profiles>
<profile>
<id>productionMode</id>
<activation>
<property>
<name>vaadin.productionMode</name>
</property>
</activation>
<properties>
<transpilation.output>${project.build.directory}/build</transpilation.output>
</properties>
<!--
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>flow-server-production-mode</artifactId>
</dependency>
</dependencies>
-->
<build>
<plugins>
<plugin>
<groupId>com.vaadin</groupId>
<artifactId>flow-maven-plugin</artifactId>
<version>${flow.maven.plugin.version}</version>
<executions>
<execution>
<goals>
<goal>copy-production-files</goal>
<goal>package-for-production</goal>
</goals>
<configuration>
<transpileOutputDirectory>${transpilation.output}</transpileOutputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.1.0</version>
<configuration>
<webResources>
<resource>
<directory>${transpilation.output}</directory>
</resource>
</webResources>
<warName>ROOT</warName>
</configuration>
</plugin>
<plugin>
<groupId>org.eclipse.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>${jetty.version}</version>
<configuration>
<webAppConfig>
<resourceBases>
<resourceBase>${transpilation.output}</resourceBase>
</resourceBases>
</webAppConfig>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>
</project>
alejandro.du
September 19, 2018, 11:18am
4
It worked okay for me. It might be that your nexus repository has one of the dependencies modified in such a way that it includes some of the log4j bridges. Have you tried compiling without it? Also, you don’t need to specify the version of the slf4j-simple dependency since you have the Vaadin BOM.