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°æ±¾£ºred hat Enterprise 4  jdk:1.6.0_13

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# set java environment
  JAVA_HOME=/usr/java/jdk1.6.0_13
  PATH=$PATH:$JAVA_HOME/bin
  CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
  export JAVA_HOME PATH CLASSPATH

[yurui@localhost tmp]$ java -version
java version "1.6.0_13"
Java(TM) SE Runtime Environment (build 1.6.0_13-b03)
Java HotSpot(TM) Client VM (build 11.3-b02, mixed mode, sharing)


HelloWorld.java´úÂ룺
public class HelloWorld{
public static void main(String[] args){
  System.out.println("hello!");
  }
}


ÔËÐÐÒ»¸öÊÔÑé³ÌÐò£º³öÏÖÒ»´ó¶Ñ´íÎó´úÂ룺
[yurui@localhost tmp]$ javac HelloWorld.java
Exception in thread "main" java.lang.ClassFormatError:

com.sun.tools.javac.main.Main (erroneous method access flags)
  at _Jv_ClassReader.throw_class_format_error(byte)

(/usr/lib/libgcj.so.5.0.0)
  at _Jv_ClassReader.handleMethod(int, int, int, int)

(/usr/lib/libgcj.so.5.0.0)
  at _Jv_ClassReader.read_methods() (/usr/lib/libgcj.so.5.0.0)
  at _Jv_ClassReader.parse() (/usr/lib/libgcj.so.5.0.0)
  at _Jv_DefineClass(java.lang.


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