動態加載罐上的AbstractMethodError

Question

I am loading a plug-in dynamically. Both the plug-in and the software have been created by us.

I have an Interface lets call it Foo. There is also FooImpl that just implements that method But FooImpl is in the jar loaded dynamically public interface Foo { void write(..someArgument..) throws Exception; }

I have also a PluginLoader class here is the method

public 
Object loadPlugin(final String jarPath, final Class 
pluginInterface) { 
    try 
    { 
     final URI uri = new File(jarPath).toURI(); 
     final URL url = uri.toURL();
 

    final URLClassLoader ucl = new URLClassLoader(new URL[] { url }); 
    try 
    { 
     final Class<?> pluginClass = Class.forName("FooImpl", true, ucl); 

     // Verify if plugin implements plugin interface. 
     if (pluginClass.getInterfaces()[0].getName().equals(pluginInterface.getName())) 
     { 
      // Instantiate plugin. 
      return pluginClass.newInstance(); 

     } }//[...] </code></pre> 

This part is actually working well i think so because after doing some sysout on the pluginClass i notice:
the .getMethods() =
[public void FooImpl.write(..someArgumentType..) throws Exception, public abstract void some.package.Foo.write(..someArgumentType..) throws Exception]

the .getGenericInterfaces() = [interface some.package.Foo]

But when i try to call the method write here is what i get
java.lang.AbstractMethodError: FooImpl.write(..SomeArgumentType..;)V
I dont know why there is a ";" and a "V"

So basically i think that it try to call the interface method instead of the implemented one. So i'm wondering What is going on!

As usual, Thank you for your time and help

Answer 1

AbstractMethodError表明您的代碼正在試圖在運行時使用不同版本的類，而不是它最初構建的類。您需要確保在執行環境中，類路徑中沒有流行的接口實現版本。