第一次创建成功,但下一次类中有变化时(如添加一些变量)会引发错误。 以下是我的代码。我想在运行时更改已加载的java类。这个怎么做?
ClassPool pool = ClassPool.getDefault();
CtClass cc=null;
final ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
if (contextClassLoader != null)
{
pool.insertClassPath(new LoaderClassPath(contextClassLoader));
}
try{
cc = pool.makeClass(className);
cc.defrost();
for (Entry<String, Class<?>> entry : properties.entrySet()) {
cc.addField(new CtField(resolveCtClass(entry.getValue()), entry.getKey(), cc));
// add getter
cc.addMethod(generateGetter(cc, entry.getKey(), entry.getValue()));
// add setter
cc.addMethod(generateSetter(cc, entry.getKey(), entry.getValue()));
}
cc.addConstructor(generateConstructor(cc,properties,className));
CtConstructor defaultCons=new CtConstructor(NO_ARGS, cc);
defaultCons.setBody(";");
cc.addConstructor(defaultCons);
return cc.toClass();
}catch(Exception e){
cc = pool.get(className);
cc.detach();
cc = pool.makeClass(className);
cc.defrost();
for (Entry<String, Class<?>> entry : properties.entrySet()) {
cc.addField(new CtField(resolveCtClass(entry.getValue()), entry.getKey(), cc));
// add getter
cc.addMethod(generateGetter(cc, entry.getKey(), entry.getValue()));
// add setter
cc.addMethod(generateSetter(cc, entry.getKey(), entry.getValue()));
}
cc.addConstructor(generateConstructor(cc,properties,className));
CtConstructor defaultCons=new CtConstructor(NO_ARGS, cc);
defaultCons.setBody(";");
cc.addConstructor(defaultCons);
return **cc.toClass();** // getting error at this line
}
*在此行发生错误*您能否告诉我们该信息? – Jens
javassist.CannotCompileException:by java.lang.LinkageError:loader(org/jboss/modules/ModuleClassLoader的实例):尝试重复名称定义 –
该消息有点强调了我在答案中给出的解释... – GhostCat