Deadlock in version 2.7

[boyshell]

thread busy-map-server-莲花洞-6-0:
java.lang.Thread.State: BLOCKED
at java.lang.ClassLoader.checkCerts(ClassLoader.java:884)
- waiting to lock <13bdd6ad> (a org.xeustechnologies.jcl.JarClassLoader) owned by "login-executor-0" t@301
at java.lang.ClassLoader.preDefineClass(ClassLoader.java:665)
at java.lang.ClassLoader.defineClass(ClassLoader.java:758)
at java.lang.ClassLoader.defineClass(ClassLoader.java:642)
at org.xeustechnologies.jcl.JarClassLoader.access$000(JarClassLoader.java:42)
at org.xeustechnologies.jcl.JarClassLoader$LocalLoader.loadClass(JarClassLoader.java:246)
at org.xeustechnologies.jcl.AbstractClassLoader.loadClass(AbstractClassLoader.java:120)
- locked <789824e1> (a java.util.Collections$SynchronizedRandomAccessList)
at org.xeustechnologies.jcl.AbstractClassLoader.loadClass(AbstractClassLoader.java:94)
at org.reflections.ReflectionUtils.forName(ReflectionUtils.java:376)
at org.reflections.ReflectionUtils.forNames(ReflectionUtils.java:397)
at org.reflections.Reflections.getSubTypesOf(Reflections.java:367)

Locked ownable synchronizers:
- locked <12e5f7cb> (a java.util.concurrent.ThreadPoolExecutor$Worker)

thread login-executor-0:
java.lang.Thread.State: BLOCKED
at org.xeustechnologies.jcl.AbstractClassLoader.loadClass(AbstractClassLoader.java:117)
- waiting to lock <789824e1> (a java.util.Collections$SynchronizedRandomAccessList) owned by "busy-map-server-莲花洞-6-0" t@205
at org.xeustechnologies.jcl.AbstractClassLoader.loadClass(AbstractClassLoader.java:94)

JNI locked monitors:
- locked <13bdd6ad> (a org.xeustechnologies.jcl.JarClassLoader)

Locked ownable synchronizers:
- locked <33c6c4f> (a java.util.concurrent.ThreadPoolExecutor$Worker)

any suggestion?

[fxgendrin]

Get the same with a deadlock with 2 threads: one has the lock on instance of the classloader and wants lock on AbstractClassLoader.loaders, the other the inverse.

Need a new release with following modification in AbstractClassLoader (as suggested in comment, but need to be compatible only with java 1.6, alternative is to duplicate ConcurrentSkipListSet into the project)
protected final Set<ProxyClassLoader> loaders = new ConcurrentSkipListSet<ProxyClassLoader>();