OMG，终于解决了IntelliJ IDEA配合Android和gradle时出现UnsupportedOperationException的问题了！

很长一段时间以来，IntelliJ IDEA一直编译不了，烦死了，决定研究研究。

先编译一次，看看idea.log，什么都没有，界面上只有个UnsupportedOperationException，发现有个bulid-log文件夹，找到了有关的log：

2014-04-28 21:01:42,661 [   1947]   INFO - .incremental.IncProjectBuilder - java.lang.UnsupportedOperationException 
org.jetbrains.jps.incremental.ProjectBuildException: java.lang.UnsupportedOperationException
at com.android.tools.idea.jps.builder.AndroidGradleTargetBuilder.build(AndroidGradleTargetBuilder.java:104)
at com.android.tools.idea.jps.builder.AndroidGradleTargetBuilder.build(AndroidGradleTargetBuilder.java:76)
at org.jetbrains.jps.incremental.BuildOperations.buildTarget(BuildOperations.java:101)
at org.jetbrains.jps.incremental.IncProjectBuilder.runBuildersForChunk(IncProjectBuilder.java:819)
at org.jetbrains.jps.incremental.IncProjectBuilder.buildTargetsChunk(IncProjectBuilder.java:857)
at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunkIfAffected(IncProjectBuilder.java:772)
at org.jetbrains.jps.incremental.IncProjectBuilder.buildChunks(IncProjectBuilder.java:595)
at org.jetbrains.jps.incremental.IncProjectBuilder.runBuild(IncProjectBuilder.java:352)
at org.jetbrains.jps.incremental.IncProjectBuilder.build(IncProjectBuilder.java:184)
at org.jetbrains.jps.cmdline.BuildRunner.runBuild(BuildRunner.java:129)
at org.jetbrains.jps.cmdline.BuildSession.runBuild(BuildSession.java:224)
at org.jetbrains.jps.cmdline.BuildSession.run(BuildSession.java:113)
at org.jetbrains.jps.cmdline.BuildMain$MyMessageHandler$1.run(BuildMain.java:133)
at org.jetbrains.jps.service.impl.SharedThreadPoolImpl$1.run(SharedThreadPoolImpl.java:41)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.run(FutureTask.java:262)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.UnsupportedOperationException
at java.util.AbstractList.add(AbstractList.java:148)
at java.util.AbstractList.add(AbstractList.java:108)
at com.android.tools.idea.jps.builder.BuilderExecutionSettings.populateHttpProxyJvmOptions(BuilderExecutionSettings.java:133)
at com.android.tools.idea.jps.builder.BuilderExecutionSettings.(BuilderExecutionSettings.java:69)
at com.android.tools.idea.jps.builder.AndroidGradleTargetBuilder.build(AndroidGradleTargetBuilder.java:101)
... 18 more

这尼玛什么情况！？！？怎么会调用AbstractList.add？看了看jdk源码，里面只有一句抛出UnsupportedOperationException的语句。又去网上一查，一般是不可变的list在调用add的时候才会这样。。那到底是什么回事啊啊啊！？！？

于是我就去找com.android.tools.idea.jps.builder.AndroidGradleTargetBuilder的源码，找到了：

https://android.googlesource.com/platform/tools/adt/idea/+/jb-mr1.1-dev-plus-aosp%5E2/android-gradle-jps/src/com/android/tools/idea/jps/builder/AndroidGradleTargetBuilder.java

1. /**
   
2.    * Builds a Gradle-based Android project using Gradle.
   
3.    */
   
4.  @Override
   
5.  publicvoid build(@NotNullAndroidGradleBuildTarget target,
   
6.                    @NotNullDirtyFilesHolder<AndroidGradleBuildTarget.RootDescriptor,AndroidGradleBuildTarget> holder,
   
7.                    @NotNullBuildOutputConsumer outputConsumer,
   
8.                    @NotNullCompileContext context)throwsProjectBuildException,IOException{
   
9.    JpsProject project= target.getProject();
   
10. 
    
11.    BuilderExecutionSettings executionSettings;
    
12.    try{
    
13.       executionSettings=newBuilderExecutionSettings();
    
14.    }catch(RuntimeException e){
    
15.      thrownewProjectBuildException(e);
    
16.    }
    
17. 
    
18.     LOG.info("Using execution settings: " + executionSettings);
    
19. 
    
20. 
    
21.    String[] buildTasks= getBuildTasks(project, context, executionSettings);
    
22.    if(buildTasks.length==0){
    
23.      String format="No build tasks found for project '%1$s'. Nothing done.";
    
24.       LOG.info(String.format(format, project.getName()));
    
25.      return;
    
26.    }
    
27. 
    
28.    String msg="Gradle build using tasks: "+Arrays.toString(buildTasks);
    
29.     context.processMessage(newProgressMessage(msg));
    
30.     LOG.info(msg);
    
31. 
    
32.     ensureTempDirExists();
    
33. 
    
34.    String androidHome=null;
    
35.    if(!isAndroidHomeKnown(executionSettings)){
    
36.       androidHome= getAndroidHomeFromModuleSdk(project);
    
37.    }
    
38. 
    
39.    String format="About to build project '%1$s' located at %2$s";
    
40.     LOG.info(String.format(format, project.getName(), executionSettings.getProjectDir().getAbsolutePath()));
    
41. 
    
42.     doBuild(context, buildTasks, executionSettings, androidHome);
    
43.  }

这些代码也没有调用List.add啊？好吧，应该看下面的Caused By：

https://android.googlesource.com/platform/tools/adt/idea/+/jb-mr1.1-dev-plus-aosp%5E2/android-gradle-jps/src/com/android/tools/idea/jps/builder/BuilderExecutionSettings.java

可是居然没有com.android.tools.idea.jps.builder.BuilderExecutionSettings.populateHttpProxyJvmOptions这个函数！？

那看来是版本不同啊。。

等等，这个名字叫populateHttpProxyJvmOptions，岂不是把IntelliJ IDEA的代理设置变为jvm的参数！！！

突然想起我的InteliJ IDEA用了proxy了。。。

然后就去掉了proxy。。然后就可以了！！！

IntelliJ IDEA真是让人想不到！代理设置会影响编译。。。。。

好吧，终究是搞定了，大家有同样问题看看代理设置吧。

然后突然发现这个问题已经被解决了：https://code.google.com/p/android/issues/detail?id=67679

感觉我好2啊。