When the vm is started with jdwp agent active and -Xcheck:jni is specified in addition, the message
WARNING: JNI local refs: xxx, exceeds capacity: 32
is issued. 'xxx' is a (varying) number significantly larger than the anticipated capacity (32). The warning message causes the newly introduced test
test/jdk/tools/launcher/TestXcheckJNIWarnings.java
to fail. The test will be enhanced by JDK-8296706 to cover the jdwp agent case as well (two test ids). The jdwp agent case will be problem-listed until this bug is resolved.

To reproduce, simply issue the command
java -Xcheck:jni -agentlib:jdwp=transport=dt_socket,server=y,suspend=n -version

If the number of outstanding JNI local refs is as expected, the checks in
src/hotspot/prims/jniCheck.cpp
should be adapted. Otherwise, it should be analysed why the number of local refs is excessive and if it can be brought down.