最近在搞javacc,也一直跟着eclipse 3.6的测试版不断更新eclipse。遇到如下问题:
现象:
javacc eclipse plugin中的javacc console中显示:
>java -classpath d:/software/develop/ide/eclipse3.6rc1/plugins/sf.eclipse.javacc_1.5.22/javacc.jar javacc plsql.jj
error: could not find main class javacc
java.lang.noclassdeffounderror: javacc
at sun.launcher.launcherhelper.checkandloadmain(launcherhelper.java:198)
caused by: java.lang.classnotfoundexception: javacc
at java.net.urlclassloader$1.run(urlclassloader.java:299)
at java.net.urlclassloader$1.run(urlclassloader.java:288)
at java.security.accesscontroller.doprivileged(native method)
at java.net.urlclassloader.findclass(urlclassloader.java:287)
at java.lang.classloader.loadclass(classloader.java:422)
at sun.misc.launcher$appclassloader.loadclass(launcher.java:325)
at java.lang.classloader.loadclass(classloader.java:355)
at sun.launcher.launcherhelper.checkandloadmain(launcherhelper.java:195)
exception in thread "main"
解决方案:
到workspace的项目根目录下,打开.settings/sf.eclipse.javacc.prefs,修改runtime_jjjar和runtime_jtbjar两个属性的值,设置为正确的路径即可。
说明:
javacc eclipse plugin把命令行的classpath路径设置到了项目路径中,更改eclipse目录的话,路径不会自动更新,还是会指向老的目录,在.setting里存在和本地环境有关的属性是一个不好的设计。