java - why does getResource give different result? -


bellow code, when run these code in ide works well, when run in dos command gives me error of nullpointexception. please give me hand. thanks! 

     //first classloader     classloader classloader = testmainpath.class.getclassloader();     //show message     system.out.println("loader=" + classloader);     //     url r = classloader.getresource("testmainpath/testmainpath.class");     system.out.println("r=" + r);     string mainpath =r.getpath();     system.out.println(mainpath);     file sf = new file(mainpath + "/main/newfile");     system.out.println(sf.getpath());     system.out.println(sf.exists());

your problem because ide not launch app do. in case difference on classpath. check how ide launch program, classpath uses. verify class file expect when launch command line.


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