我正在将应用程序从struts1.x迁移到struts2.x。在使用ant脚本构建应用程序时，我收到以下错误：
java.compile:
[mkdir] Created dir: C:\Users\R20D29TSG1\Documents\workspace\RTM\working.dir\web-common\compile\java
[javac] Compiling 1235 source files to C:\Users\R20D29TSG1\Documents\workspace\RTM\working.dir\web-common\compile\java
[javac] An exception has occurred in the compiler (1.6.0_29). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
[javac] java.lang.IllegalAccessError: tried to access class com/sun/tools/javac/parser/Keywords$1 from class com/sun/tools/javac/parser/Keywords
[javac] at com.sun.tools.javac.parser.Keywords.token2string(Keywords.java:82)
[javac] at com.sun.tools.javac.parser.Parser.classOrInterfaceOrEnumDeclaration(Parser.java:2206)
[javac] at com.sun.tools.javac.parser.Parser.typeDeclaration(Parser.java:2180)
[javac] at com.sun.tools.javac.parser.Parser.compilationUnit(Parser.java:2126)
[javac] at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:509)
[javac] at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:550)
[javac] at com.sun.tools.javac.main.JavaCompiler.parseFiles(JavaCompiler.java:804)
[javac] at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:727)
[javac] at com.sun.tools.javac.main.Main.compile(Main.java:353)
[javac] at com.sun.tools.javac.main.Main.compile(Main.java:279)
[javac] at com.sun.tools.javac.main.Main.compile(Main.java:270)
[javac] at com.sun.tools.javac.Main.compile(Main.java:69)
[javac] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[javac] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
[javac] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[javac] at java.lang.reflect.Method.invoke(Method.java:597)
[javac] at org.apache.tools.ant.taskdefs.compilers.Javac13.execute(Javac13.java:56)
[javac] at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1065)
[javac] at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:882)
[javac] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
[javac] at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
[javac] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[javac] at java.lang.reflect.Method.invoke(Method.java:597)
[javac] at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
[javac] at org.apache.tools.ant.Task.perform(Task.java:348)
[javac] at org.apache.tools.ant.Target.execute(Target.java:357)
[javac] at org.apache.tools.ant.Target.performTasks(Target.java:385)
[javac] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
[javac] at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)
[javac] at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
[javac] at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:416)
[javac] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
[javac] at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
[javac] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[javac] at java.lang.reflect.Method.invoke(Method.java:597)
[javac] at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
[javac] at org.apache.tools.ant.Task.perform(Task.java:348)
[javac] at org.apache.tools.ant.Target.execute(Target.java:357)
[javac] at org.apache.tools.ant.Target.performTasks(Target.java:385)
[javac] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
[javac] at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)
[javac] at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
[javac] at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:416)
[javac] at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:105)
[javac] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
[javac] at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
[javac] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[javac] at java.lang.reflect.Method.invoke(Method.java:597)
[javac] at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
[javac] at org.apache.tools.ant.Task.perform(Task.java:348)
[javac] at org.apache.tools.ant.Target.execute(Target.java:357)
[javac] at org.apache.tools.ant.Target.performTasks(Target.java:385)
[javac] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
[javac] at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)
[javac] at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
[javac] at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:416)
[javac] at org.apache.tools.ant.taskdefs.CallTarget.execute(CallTarget.java:105)
[javac] at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:288)
[javac] at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
[javac] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
[javac] at java.lang.reflect.Method.invoke(Method.java:597)
[javac] at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
[javac] at org.apache.tools.ant.Task.perform(Task.java:348)
[javac] at org.apache.tools.ant.Target.execute(Target.java:357)
[javac] at org.apache.tools.ant.Target.performTasks(Target.java:385)
[javac] at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1337)
[javac] at org.apache.tools.ant.Project.executeTarget(Project.java:1306)
[javac] at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
[javac] at org.apache.tools.ant.Project.executeTargets(Project.java:1189)
[javac] at org.apache.tools.ant.Main.runBuild(Main.java:758)
[javac] at org.apache.tools.ant.Main.startAnt(Main.java:217)
[javac] at org.apache.tools.ant.launch.Launcher.run(Launcher.java:257)
[javac] at org.apache.tools.ant.launch.Launcher.main(Launcher.java:104)