问初始化我的Lexer会在Antlr4中引发一个错误
EN

Stack Overflow用户

提问于 2013-10-22 19:57:30

回答 2查看 4K关注 0票数 0

大家好，

我是Antlr的新手，我花了4天的时间来学习、安装、运行教程并与IDE集成。:(

我可以在终端成功运行本教程。我现在的目标是用AntlrWorks2在Netbeans上运行同样的教程，我已经从这里吃了主板。

代码会编译，但是当我运行时，我会从Lexer的init中得到一个"java.lang.ExceptionInInitializerError“。

1：http://www.antlr.org/wiki/display/ANTLR4/Getting+Started+with+ANTLR+v4

2：http://www.certpal.com/blogs/2011/01/antlr-tutorial-hello-antlr/)

语法：

grammar Split;

@header {
    package PlayGround.AutoGen;    
}

hi      :   HELLO ID ;         // match keyword hello followed by an identifier
ID      :   [a-z]+ | [A-Z]+;     // match lower-case identifiers
WS      :   [ \t\r\n]+ -> skip ; // skip spaces, tabs, newlines
HELLO   :   '[H|h]ello';

Main：

public class MyMain {

public static void main(String args[]) {
    new MyMain().MyAttempt();
}

public void MyAttempt() {
    try {
        String string = "Hello World";
        CharStream charStream = new ANTLRInputStream(string);
/*Line 28*/ SplitLexer lex = new SplitLexer(charStream);  /*Line 28*/
        org.antlr.v4.runtime.CommonTokenStream tokens;
        tokens = new org.antlr.v4.runtime.CommonTokenStream(lex);
        SplitParser parser = new SplitParser(tokens);
        SplitParser.HiContext split = parser.hi();
        String toString = split.toString();
        System.out.println(toString);
    } catch (Exception e) {
        e.printStackTrace();
    }
}

}

错误：

run:
Exception in thread "main" java.lang.ExceptionInInitializerError
    at PlayGround.MyMain.MyAttempt(MyMain.java:28)
    at PlayGround.MyMain.main(MyMain.java:21)
Caused by: java.lang.UnsupportedOperationException: java.io.InvalidClassException: org.antlr.v4.runtime.atn.ATN; Could not deserialize ATN with version 2 (expected 3).
    at org.antlr.v4.runtime.atn.ATNSimulator.deserialize(ATNSimulator.java:132)
    at PlayGround.AutoGen.SplitLexer.<clinit>(SplitLexer.java:78)
    ... 2 more
Caused by: java.io.InvalidClassException: org.antlr.v4.runtime.atn.ATN; Could not deserialize ATN with version 2 (expected 3).
    ... 4 more
Java Result: 1
BUILD SUCCESSFUL (total time: 1 second)

答案： antlr4: ATN version 2 expected 3

java