1) maybe you can use the JNI in your java code to invoke the java compiler then check the compiler out put for those error...
2) Better to use Apache Ant for those...

本文发表在 rolia.net 枫下论坛Sorry , I didn't really get a chance to think it over. The followings are just some ideas off the top of my head.

1.The ideal is somehow to leverage the Java compiler.

2. If 1. is not doable, you may have to implement the compiling rules yourself. This is huge work, but may not that difficult as you thought at first glance because you are not going to analyze the code according to the compiling rules and search for any probable syntax errors. You are creating some specific errors.

3. You program may behave like this:
A user wants to plant a "CanNotResolveSymbol" error into your code. This error is usually about an undefined variable. so the user needs to highlight a variable and then click on item in an error list.Your program searchs where this variable is defined and removes it. This way you get a Java code with the error "Cannot resolve symbol".

This may be the simplest example, not all errors are that straightforward.
You might be having hard time with them.

In the end, I would suggest you doing more research on Internet and see what you can find before you really start work if you have enough time. Because in my solution, you never know how many cases you may have missed.

Good luck!更多精彩文章及讨论，请光临枫下论坛 rolia.net

我不是个好的设计者，因为我总喜欢把简单问题复杂化，不过你的project实在不怎么简单，所以希望我的建议有点用。

我建议你使用两项很有用的技术：
基于JSR-000094的Java Rule Engine API
和基于JSR-000175的JAVA Metadata Facility

基于Rule Engine你可以使系统得到灵活的扩展，
所有的错误可能都以Rule的形式出现，比如：
if line start with int, char, Integer.... then mark here can cause a defination mistake
if line contain { then mark here can cause a bracket not match mistake
诸如此类，只要定义好Rule Engin，以后想添加一种错误，就添加一条Rule就可以了。

通过Metadata，你可以使用Tag，来定义要执行的操作，实现你所提到的Template里面的标签。
例如：@bugtype1here{... code to remove a semicolon ...}
这样用Rule来产生Meta-Tag,再通过Meta-Tag来执行对代码的修改，基本就满足你的需要了。

另外，有一个工具叫做ANTLR，可以进行代码分析，我只是听说，没有用过，你可以试试。