new_object: accessed stale local reference

[dbrgn]

I have a simple POJO class with an empty constructor.

public IceCandidate() { }

This is what the JNI class looks like according to javap:

public class ch.dbrgn.candidateparser.IceCandidate {
  public ch.dbrgn.candidateparser.IceCandidate();
  ...
}

When I try to create a new instance for that class:

let myobj = env.new_object("ch/dbrgn/candidateparser/IceCandidate", "()V", &[]).unwrap();

...then I get a native crash.

JNI ERROR (app bug): accessed stale local reference 0x5 (index 1 in a table of size 1)
art/runtime/java_vm_ext.cc:410] JNI DETECTED ERROR IN APPLICATION: use of deleted local reference 0x5
art/runtime/java_vm_ext.cc:410]   native: #02 pc 0025a775  /system/lib/libart.so (_ZN3art9JavaVMExt8JniAbortEPKcS2_+740)
art/runtime/java_vm_ext.cc:410]   native: #03 pc 0025aecb  /system/lib/libart.so (_ZN3art9JavaVMExt9JniAbortFEPKcS2_z+74)
art/runtime/java_vm_ext.cc:410]   native: #05 pc 00101211  /system/lib/libart.so (_ZN3art11ScopedCheck5CheckERNS_18ScopedObjectAccessEbPKcPNS_12JniValueTypeE.constprop.95+684)
art/runtime/java_vm_ext.cc:410]   native: #06 pc 00108ac5  /system/lib/libart.so (_ZN3art8CheckJNI10NewObjectAEP7_JNIEnvP7_jclassP10_jmethodIDP6jvalue+436)
art/runtime/java_vm_ext.cc:410]   native: #07 pc 000099db  /data/app/ch.dbrgn.candidateparser.test-1/lib/arm/libcandidateparser_jni.so (Java_ch_dbrgn_candidateparser_CandidateParser_parseSdp+3230)

Any idea what reference that could be? I've tried to debug this for quite a while now.

[jrobsonchase]

ah crap. Can you roll your version of the jni crate back to 0.5.3 and try again? I bet it's the most recent change that did it.

[dbrgn]

Yeah, that works! 🎉

[jrobsonchase]

OK, grab version 0.6.1 now. Should be fixed!

[dbrgn]

Can confirm! :) Thanks!