CODEWITHSUNDEEP
javamavengwt
Yegoshin Maxim
Yegoshin Maxim

Reputation: 881

gwt-maven-plugin fails with NullPointerException

I've downloaded GWTP samples from github.

I've tried to build it using Maven(mvn clean install), but I've got:

[ERROR] Failed to execute goal org.codehaus.mojo:gwt-maven-plugin:2.7.0:compile (default) on project gwtp-sample-basic-spring: Execution default of goal org.codehaus.mojo:gwt-maven-plugin:2.7.0:compile failed. NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.codehaus.mojo:gwt-maven-plugin:2.7.0:compile (default) on project gwtp-sample-basic-spring: Execution default of goal org.codehaus.mojo:gwt-maven-plugin:2.7.0:compile failed.
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:592)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:323)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:247)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:104)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:427)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:157)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:121)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:31)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution default of goal org.codehaus.mojo:gwt-maven-plugin:2.7.0:compile failed.
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:114)
    at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:576)
    ... 20 more
Caused by: java.lang.NullPointerException
    at org.codehaus.mojo.gwt.ClasspathBuilder.buildClasspathList(ClasspathBuilder.java:71)
    at org.codehaus.mojo.gwt.AbstractGwtMojo.getClasspath(AbstractGwtMojo.java:223)
    at org.codehaus.mojo.gwt.shell.CompileMojo.compile(CompileMojo.java:443)
    at org.codehaus.mojo.gwt.shell.CompileMojo.doExecute(CompileMojo.java:415)
    at org.codehaus.mojo.gwt.shell.AbstractGwtShellMojo.execute(AbstractGwtShellMojo.java:159)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:105)
    ... 21 more

Currently I can't find any helpful information about NPE for gwt-maven-plugin. What I'm doing wrong? In which direction I should look to find out the reason of this error?

Upvotes: 0

Views: 534

Answers (1)

Thomas Broyer
Thomas Broyer

Reputation: 64541

Caused by: java.lang.NullPointerException
    at org.codehaus.mojo.gwt.ClasspathBuilder.buildClasspathList(ClasspathBuilder.java:71)

That line would mean that the logger hasn't been initialized. Which Maven version are you using?
The plugin has been built and validated with Maven 3.2 (and was developed with 3.0), and I just tried with Maven 3.3 and integration tests pass too; but it could be a Maven versioning issue if you're not using one of those versions.

Upvotes: 1

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