Invocation WsimportTool failed?!!

Hey there, I am making a new friend today. The meet this new friend in Eclipse Photon when I was creating a brand new web service project. Here is the story, when I first started the project, I only have the WSDL file ready in the source folder, and then I have the jaxws-maven-plugin in my pom file, like this:

  <plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>jaxws-maven-plugin</artifactId>
    <version>2.5</version>
    <executions>
      <execution>
        <goals>
          <goal>wsimport</goal>
        </goals>
        <configuration>
          <keep>true</keep>
          <extension>true</extension>
          <sourceDestDir>${basedir}/src/main/java</sourceDestDir>
          <packageName>org.huahsin68.ws</packageName>
          <wsdlDirectory>${basedir}/src/main/resources</wsdlDirectory>
          <wsdlFiles>
            <wsdlFile>hello.wsdl</wsdlFile>
          </wsdlFiles>
        </configuration>
      </execution>
    </executions>
  </plugin>

Then this error immediately shown up right after the execution tag as shown below. What was that mean? I don’t even understand why the WsimportTool could fail?

Invocation of com.sun.tools.ws.wscompile.WsimportTool failed - check output (org.codehaus.mojo:jaxws-maven-plugin:2.5:wsimport:default:generate-sources)

org.apache.maven.plugin.MojoExecutionException: Invocation of com.sun.tools.ws.wscompile.WsimportTool failed - check output
 at org.codehaus.mojo.jaxws.AbstractJaxwsMojo.exec(AbstractJaxwsMojo.java:485)
 at org.codehaus.mojo.jaxws.WsImportMojo.processLocalWsdlFiles(WsImportMojo.java:339)
 at org.codehaus.mojo.jaxws.WsImportMojo.executeJaxws(WsImportMojo.java:292)
 at org.codehaus.mojo.jaxws.MainWsImportMojo.executeJaxws(MainWsImportMojo.java:54)
 at org.codehaus.mojo.jaxws.AbstractJaxwsMojo.execute(AbstractJaxwsMojo.java:386)
 at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137)
 at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:331)
 at org.eclipse.m2e.core.internal.embedder.MavenImpl$11.call(MavenImpl.java:1362)
 at org.eclipse.m2e.core.internal.embedder.MavenImpl$11.call(MavenImpl.java:1)
 at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:177)
 at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:112)
 at org.eclipse.m2e.core.internal.embedder.MavenImpl.execute(MavenImpl.java:1360)
 at org.eclipse.m2e.core.project.configurator.MojoExecutionBuildParticipant.build(MojoExecutionBuildParticipant.java:52)
 at org.eclipse.m2e.core.internal.builder.MavenBuilderImpl.build(MavenBuilderImpl.java:137)
 at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:172)
 at org.eclipse.m2e.core.internal.builder.MavenBuilder$1.method(MavenBuilder.java:1)
 at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod$1$1.call(MavenBuilder.java:115)
 at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:177)
 at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:112)
 at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod$1.call(MavenBuilder.java:105)
 at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:177)
 at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
 at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)
 at org.eclipse.m2e.core.internal.builder.MavenBuilder$BuildMethod.execute(MavenBuilder.java:86)
 at org.eclipse.m2e.core.internal.builder.MavenBuilder.build(MavenBuilder.java:200)
 at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:795)
 at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
 at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:216)
 at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:259)
 at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:312)
 at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
 at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:315)
 at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:367)
 at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:388)
 at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:142)
 at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:232)
 at org.eclipse.core.internal.jobs.Worker.run(Worker.java:60)

Googling the around some said that this is a defect from the IDE; some even said that this could be caused by the JAVA version issue; some even said JDK 8 is not supported in Eclipse Mars version. Does it true? Not really. Firstly, I issued a command mvn clean and then follow by mvn generate-sources. The error is gone! What a weird day?!!