linux - Java Class.isAssignableFrom ALWAYS returning false... only outside IDE -

i've tested on 3 windows machines, , 2 linux vpses, on different versions of java, both on openjdk & oracle jdk. functioned perfectly, , of sudden, works in ide, though haven't changed relevant code, , can't imagine can cause this.

prevalent code in system:

class<?> cls = (session == null ? secjlcl : session.getjlcl()).loadclass(name); logger.log(javaloader.class.isassignablefrom(cls) + " - " + cls + " - " + cls.getsuperclass().getname()); if (javaloader.class.isassignablefrom(cls)) { 

and classloader:

public class javaloaderclassloader extends urlclassloader { public javaloaderclassloader(url[] url, classloader parent) {     super(url); }  private hashmap<string, class<?>> javaloaders = new hashmap<string, class<?>>();  public string addclass(byte[] data) throws linkageerror {     class<?> cls = defineclass(null, data, 0, data.length);     javaloaders.put(cls.getname(), cls);     return cls.getname(); }  public class<?> loadclass(string name, boolean resolve) {     if (javaloaders.containskey(name)) return javaloaders.get(name);     try {         class<?> see = super.loadclass(name, resolve);         if (see != null) return see;     }catch (classnotfoundexception e) {         logger.logerror(e);     }     return null; }  public void finalize() throws throwable {     super.finalize();     javaloaders = null; } } 

one note, expect many classloaders load different file in same name/package, use separate classloaders keep them separate, in testing, not tested.

now, had worked flawlessly in past, , have 0 clue why stopped. assume broke something, code still works in ide?

this appears bug:

public javaloaderclassloader(url[] url, classloader parent) {     super(url); } 

you aren't installing parent parent class loader through super constructor.