mvn compile ends up in mapping error

[skinkie]

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project onebusaway-gtfs: Compilation failure
[ERROR] /home/skinkie/dev/onebusaway-gtfs-modules/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/impl/GtfsRelationalDaoImpl.java:[325,31] incompatible types; no instance(s) of type variable(s) C exist so that java.util.Map<K,C> conforms to java.util.Map<K,java.util.List>
[ERROR] found : java.util.Map<K,C>
[ERROR] required: java.util.Map<K,java.util.List>
[ERROR] -> [Help 1]

[skinkie]

org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project onebusaway-gtfs: Compilation failure
/home/skinkie/dev/onebusaway-gtfs-modules/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/impl/GtfsRelationalDaoImpl.java:[325,31] incompatible types; no instance(s) of type variable(s) C exist so that java.util.Map<K,C> conforms to java.util.Map<K,java.util.List>
found : java.util.Map<K,C>
required: java.util.Map<K,java.util.List>

    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:213)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:616)
    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)

Caused by: org.apache.maven.plugin.CompilationFailureException: Compilation failure
/home/skinkie/dev/onebusaway-gtfs-modules/onebusaway-gtfs/src/main/java/org/onebusaway/gtfs/impl/GtfsRelationalDaoImpl.java:[325,31] incompatible types; no instance(s) of type variable(s) C exist so that java.util.Map<K,C> conforms to java.util.Map<K,java.util.List>
found : java.util.Map<K,C>
required: java.util.Map<K,java.util.List>

    at org.apache.maven.plugin.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:656)
    at org.apache.maven.plugin.CompilerMojo.execute(CompilerMojo.java:128)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    ... 19 more

[bdferris]

Are you still seeing this error? What OS + JDK + version of Maven are you using?

[skinkie]

I am:
java version "1.6.0_24"
OpenJDK Runtime Environment (IcedTea6 1.11.4) (Gentoo build 1.6.0_24-b24)
OpenJDK 64-Bit Server VM (build 20.0-b12, mixed mode)

Apache Maven 3.0.4 (r1232337; 2012-01-17 09:44:56+0100)
Maven home: /usr/share/maven-bin-3.0
Java version: 1.6.0_24, vendor: Sun Microsystems Inc.
Java home: /opt/icedtea-bin-6.1.11.4/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "3.4.9-gentoo", arch: "amd64", family: "unix"

[bdferris]

Based on some Googling on the subject, it sounds like it might be a type-inference bug in OpenJDK6?

https://bugs.openjdk.java.net/show_bug.cgi?id=100167

I'm guessing it won't be fixed since Java 6 is EOL. Any chance you'd consider upgrading to OpenJDK7 (where this has apparently been fixed)?

If we can find some Java generics magic to get this compiling for you under OpenJDK6, I'm not opposed to changing the OBA code. That said, I don't really have a machine I can test this on. If you can play with it, I'd definitely accept a patch.

[skinkie]

If it is a Java 6 bug, I'll just close this ticket.

[duliu1990]

i have the same question , can you help me how to solve it?
Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.

[bdferris]

duliu1990, Are you running Java 6?

[duliu1990]

yes java jdk version 1.6.20

------------------ 原始邮件 ------------------
发件人: "Brian Ferris";notifications@github.com;
发送时间: 2014年4月1日(星期二) 晚上10:41
收件人: "OneBusAway/onebusaway-gtfs-modules"onebusaway-gtfs-modules@noreply.github.com;
抄送: "飘落的树叶"492062702@qq.com;
主题: Re: [onebusaway-gtfs-modules] mvn compile ends up in mapping error(#31)

duliu1990, Are you running Java 6?

—
Reply to this email directly or view it on GitHub.

[bdferris]

Since this was a bug in the JDK, your best bet is to upgrade to the latest 1.6 (since you are many versions behind at this point) or, even better, upgrade to 1.7 (since 1.6 is end-of-lifed anyway).