Widget compile error when update from vaadin 7 to vaadin 8

Dao3 · December 17, 2017, 10:46pm

Hi, I just try to update my project from vaadin 7 to vaddin 8, but have this error when compiling the widget.

[INFO]
 --- vaadin-maven-plugin:8.1.7:compile (default-cli) @ chekov ---
[INFO]
 auto discovered modules [nz.co.cloudm.chekov.core.ChekovWidgetset]

[INFO]
 Using com.vaadin:vaadin-client-compiler version 8.1.7
[INFO]
 Loading inherited module 'nz.co.cloudm.chekov.core.ChekovWidgetset'
[INFO]
    Loading inherited module 'com.vaadin.v7.Vaadin7WidgetSet'
[INFO]
       Loading inherited module 'com.vaadin.DefaultWidgetSet'
[INFO]
          Loading inherited module 'com.vaadin.Vaadin'
[INFO]
             Loading inherited module 'com.google.gwt.user.User'
[INFO]
                Loading inherited module 'com.google.gwt.event.Event'
[INFO]
                   Loading inherited module 'com.google.gwt.dom.DOM'
[INFO]
                      Loading inherited module 'com.google.gwt.safehtml.SafeHtml'
[INFO]
                         Loading inherited module 'com.google.gwt.http.HTTP'
[INFO]
                            Loading inherited module 'com.google.gwt.user.Timer'
[INFO]
                               [ERROR]
 Line 19: Unexpected exception while processing element 'source'
[INFO]
 java.lang.NoClassDefFoundError: org/apache/tools/ant/types/ZipScanner
[INFO]
     at com.google.gwt.dev.resource.impl.DefaultFilters.getScanner(DefaultFilters.java:240)
[INFO]
     at com.google.gwt.dev.resource.impl.DefaultFilters$4.<init>(DefaultFilters.java:371)
[INFO]
     at com.google.gwt.dev.resource.impl.DefaultFilters.getCustomFilter(DefaultFilters.java:370)
[INFO]
     at com.google.gwt.dev.resource.impl.DefaultFilters.customJavaFilter(DefaultFilters.java:301)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDef.addSourcePackageImpl(ModuleDef.java:257)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDef.addSourcePackage(ModuleDef.java:246)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.addSourcePackage(ModuleDefSchema.java:860)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.addSourcePackage(ModuleDefSchema.java:817)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__source_end(ModuleDefSchema.java:717)
[INFO]
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO]
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[INFO]
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]
     at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]
     at com.google.gwt.dev.util.xml.HandlerMethod.invokeEnd(HandlerMethod.java:272)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.endElement(ReflectiveParser.java:174)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:349)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$200(ReflectiveParser.java:70)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:431)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:316)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__inherits_begin(ModuleDefSchema.java:501)
[INFO]
     at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
[INFO]
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]
     at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]
     at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:230)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:296)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:349)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$200(ReflectiveParser.java:70)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:431)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:316)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__inherits_begin(ModuleDefSchema.java:501)
[INFO]
     at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
[INFO]
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]
     at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]
     at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:230)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:296)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:349)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$200(ReflectiveParser.java:70)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:431)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:316)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__inherits_begin(ModuleDefSchema.java:501)
[INFO]
     at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
[INFO]
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]
     at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]
     at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:230)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:296)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:349)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$200(ReflectiveParser.java:70)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:431)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:316)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__inherits_begin(ModuleDefSchema.java:501)
[INFO]
     at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
[INFO]
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]
     at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]
     at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:230)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:296)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:349)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$200(ReflectiveParser.java:70)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:431)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:316)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__inherits_begin(ModuleDefSchema.java:501)
[INFO]
     at sun.reflect.GeneratedMethodAccessor6.invoke(Unknown Source)
[INFO]
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]
     at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]
     at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:230)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:296)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:349)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$200(ReflectiveParser.java:70)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:431)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:316)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__inherits_begin(ModuleDefSchema.java:501)
[INFO]
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO]
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[INFO]
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]
     at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]
     at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:230)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:296)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:349)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$200(ReflectiveParser.java:70)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:431)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:316)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__inherits_begin(ModuleDefSchema.java:501)
[INFO]
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO]
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[INFO]
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]
     at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]
     at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:230)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:296)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:349)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$200(ReflectiveParser.java:70)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:431)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:316)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__inherits_begin(ModuleDefSchema.java:501)
[INFO]
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO]
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[INFO]
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]
     at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]
     at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:230)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:296)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:349)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$200(ReflectiveParser.java:70)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:431)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:316)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefSchema$BodySchema.__inherits_begin(ModuleDefSchema.java:501)
[INFO]
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[INFO]
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
[INFO]
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[INFO]
     at java.lang.reflect.Method.invoke(Method.java:498)
[INFO]
     at com.google.gwt.dev.util.xml.HandlerMethod.invokeBegin(HandlerMethod.java:230)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.startElement(ReflectiveParser.java:296)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractXMLDocumentParser.emptyElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.dtd.XMLDTDValidator.emptyElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
[INFO]
     at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
[INFO]
     at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.parse(ReflectiveParser.java:349)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser$Impl.access$200(ReflectiveParser.java:70)
[INFO]
     at com.google.gwt.dev.util.xml.ReflectiveParser.parse(ReflectiveParser.java:431)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.nestedLoad(ModuleDefLoader.java:316)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.load(ModuleDefLoader.java:243)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.doLoadModule(ModuleDefLoader.java:193)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.loadFromResources(ModuleDefLoader.java:151)
[INFO]
     at com.google.gwt.dev.cfg.ModuleDefLoader.loadFromClassPath(ModuleDefLoader.java:126)
[INFO]
     at com.google.gwt.dev.Compiler.compile(Compiler.java:139)
[INFO]
     at com.google.gwt.dev.Compiler$1.run(Compiler.java:118)
[INFO]
     at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
[INFO]
     at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
[INFO]
     at com.google.gwt.dev.Compiler.main(Compiler.java:125)
[INFO]
 Caused by: java.lang.ClassNotFoundException: org.apache.tools.ant.types.ZipScanner
[INFO]
     at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
[INFO]
     at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
[INFO]
     at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
[INFO]
     ... 222 more
[INFO]
 ------------------------------------------------------------------------
[INFO]
 BUILD FAILURE
[INFO]
 ------------------------------------------------------------------------

Any one have this problem?

Tatu2 · December 18, 2017, 9:52am

Something similar is reported here: https://groups.google.com/forum/#!topic/Google-Web-Toolkit-Contributors/fdWmFBtKvGA

I think it is caused by dependency conflict, i.e. you have dependency to different versions of the same jar via two different routes, and compile attempts to use wrong one, hence error.

You could inspect you dependencies with “mvn dependency:tree” command, and when you find the conflict, attempt to exclude the other one.