我正在使用Groovy ConfigSlurper从Groovy脚本加载一个大型groovy文件(741KB),并在尝试进行编译时始终收到RuntimeException.

Groovy 2.1.1,Java 1.6(Apple / MacOSX)

我称之为：

conf = new ConfigSlurper().parse(new File('conf.groovy').toURL())

并始终获得以下例外. ConfigSlurper可以编译的文件大小是否存在已知限制？

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
General error during class generation: Class file too large!

java.lang.RuntimeException: Class file too large!
  at org.objectweb.asm.ClassWriter.toByteArray(Unknown Source)
  at org.codehaus.groovy.control.CompilationUnit$15.call(CompilationUnit.java:797)
  at org.codehaus.groovy.control.CompilationUnit.applyToPrimaryClassNodes(CompilationUnit.java:1036)
  at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:573)
  at org.codehaus.groovy.control.CompilationUnit.processPhaseOperations(CompilationUnit.java:551)
  at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:528)
  at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:279)
  at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:258)
  at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:244)
  at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:202)
  at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:212)
  at groovy.lang.GroovyClassLoader$parseClass.call(Unknown Source)
  at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
  at groovy.util.ConfigSlurper.parse(ConfigSlurper.groovy:146)
  at groovy.util.ConfigSlurper$parse.call(Unknown Source)
  at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108)
  at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:116)
  at write_users.run(write_users.groovy:19)
  at groovy.lang.GroovyShell.runScriptOrMainOrTestOrRunnable(GroovyShell.java:257)
  at groovy.lang.GroovyShell.run(GroovyShell.java:220)
  at groovy.lang.GroovyShell.run(GroovyShell.java:150)
  at groovy.ui.GroovyMain.processOnce(GroovyMain.java:588)
  at groovy.ui.GroovyMain.run(GroovyMain.java:375)
  at groovy.ui.GroovyMain.process(GroovyMain.java:361)
  at groovy.ui.GroovyMain.processArgs(GroovyMain.java:120)
  at groovy.ui.GroovyMain.main(GroovyMain.java:100)
  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 org.codehaus.groovy.tools.GroovyStarter.rootLoader(GroovyStarter.java:106)
  at org.codehaus.groovy.tools.GroovyStarter.main(GroovyStarter.java:128)

1 error

解决方法:

有一个已知的限制,但可以说它不是Groovy;它是ASM library,最终是Java.

正如Stuart Halloway在谈话中提到的那样,知道在抽象层次之下的一层发生了什么通常很有见地.

例如,this link显示此代码：

public byte[] toByteArray() {
        if (index > Short.MAX_VALUE) {
            throw new RuntimeException("Class file too large!");
        }

……可能是此处显示的例外情况：

java.lang.RuntimeException: Class file too large!
  at org.objectweb.asm.ClassWriter.toByteArray(Unknown Source)

为什么ASM方法会抛出此异常？ This post州：

It turns out that the magic number for the “code too large” error is
65535 bytes (compiled byte code, not source code).

对于Groovy的内部实现,该文件可能太大,这会导致合成方法对于JVM来说太大.