大家好,我一直在javassist库中尝试,似乎遇到了一个我无法跨越的障碍。问题是,我想动态创建一个config类来扩展jersey的resourceconfig类,并在构造函数中注册要注入的包和工厂对象。但每次我出错(贴在下面)
public static void main(String[] args) throws Exception {
// TODO Auto-generated method stub
ClassPool pool = ClassPool.getDefault();
CtClass superCc = null;
try {
superCc = pool.get(ResourceConfig.class.getCanonicalName());
} catch (NotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
try {
CtClass cc = pool.makeClass("org.demonking.AppConfig");
cc.setSuperclass(superCc);
System.out.println(cc.getSuperclass().getName());
CtConstructor constructor = new CtConstructor(new CtClass[0], cc);
constructor.setBody("{\n"+"packages(\"org.demonking\");"+"\n"+"register(InjectorDemo.class);"+"\n"+"}");
cc.addConstructor(constructor);
} catch (CannotCompileException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//rest of my jersey code
}
我要动态创建的原始appconfig(工作正常)
public class AppConfig extends ResourceConfig{
public AppConfig()
{
packages("org.demonking");
register(new AbstractBinder(){
@Override
protected void configure() {
bindFactory(ContextHelperFactory.class)
.to(ContextHelper.class)
.in(RequestScoped.class);
}
});
}
注意,在研究时,我发现javassist对于匿名内部类有一些限制,因此代码被转移到injectordemo类。
public class InjectorDemo extends AbstractBinder {
@Override
protected void configure() {
// TODO Auto-generated method stub
bindFactory(ContextHelperFactory.class)
.to(ContextHelper.class)
.in(RequestScoped.class);
}
}
错误
javassist.CannotCompileException: [source error] packages(java.lang.String) not found in org.demonking.AppConfig
at javassist.CtBehavior.setBody(CtBehavior.java:446)
at javassist.CtBehavior.setBody(CtBehavior.java:412)
at javassist.CtConstructor.setBody(CtConstructor.java:217)
at org.logicunit.JavassistDemoMain.main(JavassistDemoMain.java:42)
Caused by: compile error: packages(java.lang.String) not found in org.demonking.AppConfig
at javassist.compiler.TypeChecker.atMethodCallCore(TypeChecker.java:749)
at javassist.compiler.TypeChecker.atCallExpr(TypeChecker.java:695)
at javassist.compiler.JvstTypeChecker.atCallExpr(JvstTypeChecker.java:157)
at javassist.compiler.ast.CallExpr.accept(CallExpr.java:46)
at javassist.compiler.CodeGen.doTypeCheck(CodeGen.java:242)
at javassist.compiler.CodeGen.atStmnt(CodeGen.java:330)
at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)
at javassist.compiler.CodeGen.atStmnt(CodeGen.java:351)
at javassist.compiler.ast.Stmnt.accept(Stmnt.java:50)
at javassist.compiler.CodeGen.atMethodBody(CodeGen.java:292)
at javassist.compiler.Javac.compileBody(Javac.java:223)
at javassist.CtBehavior.setBody(CtBehavior.java:438)
1条答案
按热度按时间f45qwnt81#
对于任何有相同问题的人来说,解决方法是使用正确的参数正确地调用方法在我的例子中,packages方法在我传递字符串时排除了varargs参数,一旦我发现如何通过javassist调用带有varargs参数的方法,我就让代码正常工作了。这是为我做了诀窍的线https://issues.jboss.org/browse/jassist-192?_sscc=t