如果jar文件引发异常，如何在批处理文件中处理.jar文件（System.exit（）没有任何退出代码）的输出？

Question

I have an existing very large number of .jar files and I'm supposed to catch if any exception arises and then need to call a different .jar file. This could have been done by catching the exception and setting an exit code and then checking in the batch file but there's a large number of .jar files.

JAR file looks this way:

public class FileProcessor{
    public static void main(String[] args){
        try{
        }catch(Exception ex){
        //if error occurs, a mail gets send
        }
    }
}

Is there any alternative way without changing the .jar file and just work on the batch file.

Answer 1

I'm confident there isn't a trivial way to do this from a batch file.

However there may be a way to do it without editing the Java. Instead of calling into the jar directly from a batch file, you could call it from another Java application and use reflection to override the methods that have catch blocks that you need to set an exit code for.

This is probably more work than your suggestion and you may be better off editing the existing Java to behave as you want it to with exit codes.