不能编译代码

Question

我想补充JsonPut & JsontPost方法在RestHelper类像波纹管相同的路径：

object MembershipAPI extends RestHelper with LogHelper { 
    serve { 
    case JsonPost("api" :: "v1" :: "group_memberships" :: group_id :: user_id :: Nil, request) => 
    () => Full(GroupMembershipController.Join(group_id, user_id, request)) 
    case JsonPut("api" :: "v1" :: "group_memberships" :: group_id :: user_id :: Nil, request) => 
    () => Full(GroupMembershipController.Join(group_id, user_id, request)) 
    case JsonDelete("api" :: "v1" :: "group_memberships" :: group_id :: user_id :: Nil, request) => 
    () => Full(GroupMembershipController.Leave(group_id, user_id, request)) 
    } 
} 

而且运行SBT编译时，我得到这个错误：

java.lang.Error: ch.epfl.lamp.fjbg.JCode$OffsetTooBigException: offset too big to fit in 16 bits: 51511 
    at ch.epfl.lamp.fjbg.JFieldOrMethod.writeTo(JFieldOrMethod.java:130) 
    at ch.epfl.lamp.fjbg.JClass.writeTo(JClass.java:358) 
    at scala.tools.nsc.backend.jvm.BytecodeWriters$ClassBytecodeWriter$class.writeClass(BytecodeWriters.scala:87) 
    at scala.tools.nsc.backend.jvm.GenJVM$JvmPhase$$anon$2.writeClass(GenJVM.scala:82) 
    at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator.emitClass(GenJVM.scala:172) 
    at scala.tools.nsc.backend.jvm.GenJVM$BytecodeGenerator.genClass(GenJVM.scala:304) 
    at scala.tools.nsc.backend.jvm.GenJVM$JvmPhase$$anonfun$run$4.apply(GenJVM.scala:86) 
    at scala.tools.nsc.backend.jvm.GenJVM$JvmPhase$$anonfun$run$4.apply(GenJVM.scala:86) 
    at scala.collection.mutable.HashMap$$anon$2$$anonfun$foreach$3.apply(HashMap.scala:102) 
    at scala.collection.mutable.HashMap$$anon$2$$anonfun$foreach$3.apply(HashMap.scala:102) 
    at scala.collection.Iterator$class.foreach(Iterator.scala:652) 
    at scala.collection.mutable.HashTable$$anon$1.foreach(HashTable.scala:157) 
    at scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:190) 
    at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:43) 
    at scala.collection.mutable.HashMap$$anon$2.foreach(HashMap.scala:102) 
    at scala.tools.nsc.backend.jvm.GenJVM$JvmPhase.run(GenJVM.scala:86) 
    at scala.tools.nsc.Global$Run.compileSources(Global.scala:949) 
    at scala.tools.nsc.Global$Run.compile(Global.scala:1034) 
    at xsbt.CompilerInterface.run(CompilerInterface.scala:81) 
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) 
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) 
    at java.lang.reflect.Method.invoke(Method.java:597) 
    at xsbt.AnalyzingCompiler.call(AnalyzingCompiler.scala:40) 
    at xsbt.AnalyzingCompiler.apply(AnalyzingCompiler.scala:18) 
    at sbt.Compile.processScala(Compile.scala:76) 
    at sbt.CompilerCore$$anonfun$1.apply(Compile.scala:27) 
    at sbt.CompilerCore$$anonfun$1.apply(Compile.scala:27) 
    at sbt.CompilerCore$$anonfun$process$1$1.apply(Compile.scala:22) 
    at sbt.CompilerCore$$anonfun$process$1$1.apply(Compile.scala:22) 
    at sbt.CompilerCore$$anonfun$doCompile$3.apply(Compile.scala:45) 
    at sbt.CompilerCore$$anonfun$doCompile$3.apply(Compile.scala:42) 
    at scala.Option.orElse(Option.scala:102) 
    at sbt.CompilerCore.doCompile(Compile.scala:41) 
    at sbt.CompilerCore.apply(Compile.scala:29) 
    at sbt.AbstractCompileConditional.run$1(Conditional.scala:341) 
    at sbt.AbstractCompileConditional$$anonfun$3.apply(Conditional.scala:344) 
    at sbt.AbstractCompileConditional$$anonfun$3.apply(Conditional.scala:344) 
    at sbt.classfile.Analyze$.apply(Analyze.scala:110) 
    at sbt.AbstractCompileConditional.execute(Conditional.scala:344) 
    at sbt.Conditional$class.run(Conditional.scala:43) 
    at sbt.AbstractCompileConditional.run(Conditional.scala:231) 
    at sbt.BasicScalaProject.sbt$BasicScalaProject$$doCompile(DefaultProject.scala:260) 
    at sbt.BasicScalaProject$$anonfun$compileAction$1.apply(DefaultProject.scala:274) 
    at sbt.BasicScalaProject$$anonfun$compileAction$1.apply(DefaultProject.scala:274) 
    at sbt.TaskManager$Task.invoke(TaskManager.scala:62) 
    at sbt.impl.RunTask.doRun$1(RunTask.scala:77) 
    at sbt.impl.RunTask.runTask(RunTask.scala:85) 
    at sbt.impl.RunTask.run(RunTask.scala:32) 
    at sbt.impl.RunTask$.apply(RunTask.scala:17) 
    at sbt.impl.RunTask$.apply(RunTask.scala:16) 
    at sbt.Project$class.run(Project.scala:98) 
    at sbt.Project$class.act(Project.scala:129) 
    at sbt.BasicScalaProject.act(DefaultProject.scala:21) 
    at sbt.xMain$$anonfun$8.apply(Main.scala:530) 
    at sbt.xMain$$anonfun$8.apply(Main.scala:530) 
    at sbt.xMain.withAction(Main.scala:563) 
    at sbt.xMain.sbt$xMain$$handleAction(Main.scala:530) 
    at sbt.xMain.handleCommand(Main.scala:520) 
    at sbt.xMain.processAction(Main.scala:459) 
    at sbt.xMain.process$1(Main.scala:257) 
    at sbt.xMain.processArguments(Main.scala:266) 
    at sbt.xMain.startProject(Main.scala:107) 
    at sbt.xMain.run(Main.scala:84) 
    at sbt.xMain.run0$1(Main.scala:35) 
    at sbt.xMain.run(Main.scala:42) 
    at xsbt.boot.Launch$.run(Launch.scala:53) 
    at xsbt.boot.Launch$$anonfun$explicit$1.apply(Launch.scala:42) 
    at xsbt.boot.Launch$$anonfun$explicit$1.apply(Launch.scala:42) 
    at xsbt.boot.Launch$.launch(Launch.scala:57) 
    at xsbt.boot.Launch$.explicit(Launch.scala:42) 
    at xsbt.boot.Launch$.initialized(Launch.scala:38) 
    at xsbt.boot.Launch$.parsed(Launch.scala:31) 
    at xsbt.boot.Launch$.configured(Launch.scala:21) 
    at xsbt.boot.Launch$.apply(Launch.scala:16) 
    at xsbt.boot.Launch$.apply(Launch.scala:13) 
    at xsbt.boot.Boot$.runImpl(Boot.scala:24) 
    at xsbt.boot.Boot$.run(Boot.scala:19) 
    at xsbt.boot.Boot$.main(Boot.scala:15) 
    at xsbt.boot.Boot.main(Boot.scala) 
Caused by: ch.epfl.lamp.fjbg.JCode$OffsetTooBigException: offset too big to fit in 16 bits: 51511 
    at ch.epfl.lamp.fjbg.JCode.checkOffset16(JCode.java:903) 
    at ch.epfl.lamp.fjbg.JCode.patchAllOffset(JCode.java:982) 
    at ch.epfl.lamp.fjbg.JCode.freeze(JCode.java:102) 
    at ch.epfl.lamp.fjbg.JMethod.freeze(JMethod.java:89) 
    at ch.epfl.lamp.fjbg.JFieldOrMethod.writeTo(JFieldOrMethod.java:127) 
    ... 79 more 
Error during sbt execution: java.lang.Error: ch.epfl.lamp.fjbg.JCode$OffsetTooBigException: offset too big to fit in 16 bits: 51511 

我不知道它为什么会发生，以及如何能解决呢？

预先感谢您！

Answer 1

创建的部分函数太大，Scala编译器无法编译。它是一个带有scala编译器的issue。

要解决该问题，您需要将选择器分解为多个服务语句。因此，只需找到一个有逻辑中断的地方并制作两个RestHelper函数即可。

例如，

object MembershipAPIOne extends RestHelper with LogHelper { 
    serve { 
    case JsonPost("api" :: "v1" :: "group_memberships" :: group_id :: user_id :: Nil, request) => 
    () => Full(GroupMembershipController.Join(group_id, user_id, request)) 
    case JsonPut("api" :: "v1" :: "group_memberships" :: group_id :: user_id :: Nil, request) => 
() => Full(GroupMembershipController.Join(group_id, user_id, request)) 
    } 
} 

object MembershipAPITwo extends RestHelper with LogHelper { 
    serve { 
case JsonDelete("api" :: "v1" :: "group_memberships" :: group_id :: user_id :: Nil, request) => 
() => Full(GroupMembershipController.Leave(group_id, user_id, request)) 
} 
} 

更多的帮助，请参见http://www.assembla.com/spaces/liftweb/wiki/REST_Web_Services。