Execution might get stuck while handling references.

[XerTheSquirrel]

In String.intern(), execution may potentially get stuck while trying to intern() a String. Additionally this may happen in other locations.

See:

• https://app.circleci.com/pipelines/github/SquirrelJME/SquirrelJME/2494/workflows/3dce58b8-876e-4c03-b27c-848c1105e157/jobs/15034.
• https://app.circleci.com/pipelines/github/SquirrelJME/SquirrelJME/2518/workflows/a3e766a2-5015-4530-8929-e6666d9ebd42/jobs/15207/tests#failed-test-0.

Java Over-Layer: Loading /home/circleci/project/emulators/emulator-base/build/lib/main/release/libemulator-base.so...
JNI Sub-Level: Loading Library...
Java Over-Layer: Binding methods...
JNI Sub-Level: Binding Methods...
JNI Sub-Level: Methods are now bound!
Java Over-Layer: Methods bound!
Java Over-Layer: Loading took 14ms
DB: Registering cldc-compact.jar (/home/circleci/project/modules/cldc-compact/build/squirreljme/vm-main-springcoat/cldc-compact.jar)
DB: Registering io.jar (/home/circleci/project/modules/io/build/squirreljme/vm-main-springcoat/io.jar)
DB: Registering collections.jar (/home/circleci/project/modules/collections/build/squirreljme/vm-main-springcoat/collections.jar)
DB: Registering tool-manifest-reader.jar (/home/circleci/project/modules/tool-manifest-reader/build/squirreljme/vm-main-springcoat/tool-manifest-reader.jar)
DB: Registering strings.jar (/home/circleci/project/modules/strings/build/squirreljme/vm-main-springcoat/strings.jar)
DB: Registering meep-midlet.jar (/home/circleci/project/modules/meep-midlet/build/squirreljme/vm-main-springcoat/meep-midlet.jar)
DB: Registering tool-manifest-writer.jar (/home/circleci/project/modules/tool-manifest-writer/build/squirreljme/vm-main-springcoat/tool-manifest-writer.jar)
DB: Registering tac.jar (/home/circleci/project/modules/tac/build/squirreljme/vm-main-springcoat/tac.jar)
DB: Registering cldc-compact-test.jar (/home/circleci/project/modules/cldc-compact/build/squirreljme/vm-test-springcoat/cldc-compact-test.jar)
Starting virtual machine (in net.multiphasicapps.tac.MainSingleRunner)...
DB: Starting main thread...
TD: Implement newInstance() access checks.
TD: Check permission: ("java.util.PropertyPermission" "lang.testmonitornotify.1")
DB: SET sub-after-sleep=int:5
DB: SET before-lock=int:0
DB: SET thread-created=int:2
DB: SET sub-in-lock=int:3
DB: SET in-lock=int:1
DB: SET sub-started=true
DB: SET after-lock=int:7
DB: SET expected-resume=int:6
DB: SET sub-after-notify=int:4
DB: About to run test...
DB: SET before-lock=int:0
DB: SET in-lock=int:1
BK2c
EXCEPTION SpringThread #2: hwThread-1
  | IN java.lang.ref.Reference (Reference.java)
  |- .get:()Ljava/lang/Object; @0 (:204 INVOKESTATIC@14)
  | IN java.lang.String (String.java)
  |- .intern:()Ljava/lang/String; @0 (:881 INVOKEVIRTUAL@48)
  | IN <guard>
  |- .<guard> @0
  | IN java.lang.Boolean (Boolean.java)
  |- .toString:(Z)Ljava/lang/String; @0 (:168 LDC@4)
  |- .toString:()Ljava/lang/String; @0 (:125 INVOKESTATIC@4)
  | IN net.multiphasicapps.tac.DataSerialization (DataSerialization.java)
  |- .serialize:(Ljava/lang/Object;)Ljava/lang/String; @0 (:249 INVOKEVIRTUAL@55)
  | IN net.multiphasicapps.tac.TestResultBuilder (TestResultBuilder.java)
  |- .putSecondaryValue:(Ljava/lang/String;Ljava/lang/Object;)V @0 (:150 INVOKESTATIC@17)
  | IN net.multiphasicapps.tac.__CoreTest__ (__CoreTest__.java)
  |- .secondary:(Ljava/lang/String;Ljava/lang/Object;)V @0 (:234 INVOKEVIRTUAL@6)
  | IN lang.TestMonitorNotify$__Sub__ (TestMonitorNotify.java)
  |- .run:()V @0 (:92 INVOKEVIRTUAL@12)
  | IN java.lang.__Start__ (__Start__.java)
  |- .__base:()V @0 (:72 INVOKEINTERFACE@43)
BK2c
EXCEPTION SpringThread #2: hwThread-1
  | IN java.lang.ref.Reference (Reference.java)
  |- .get:()Ljava/lang/Object; @0 (:203 GOTO@20)
  | IN java.lang.String (String.java)
  |- .intern:()Ljava/lang/String; @0 (:881 INVOKEVIRTUAL@48)
  | IN <guard>
  |- .<guard> @0
  | IN java.lang.Boolean (Boolean.java)
  |- .toString:(Z)Ljava/lang/String; @0 (:168 LDC@4)
  |- .toString:()Ljava/lang/String; @0 (:125 INVOKESTATIC@4)
  | IN net.multiphasicapps.tac.DataSerialization (DataSerialization.java)
  |- .serialize:(Ljava/lang/Object;)Ljava/lang/String; @0 (:249 INVOKEVIRTUAL@55)
  | IN net.multiphasicapps.tac.TestResultBuilder (TestResultBuilder.java)
  |- .putSecondaryValue:(Ljava/lang/String;Ljava/lang/Object;)V @0 (:150 INVOKESTATIC@17)
  | IN net.multiphasicapps.tac.__CoreTest__ (__CoreTest__.java)
  |- .secondary:(Ljava/lang/String;Ljava/lang/Object;)V @0 (:234 INVOKEVIRTUAL@6)
  | IN lang.TestMonitorNotify$__Sub__ (TestMonitorNotify.java)
  |- .run:()V @0 (:92 INVOKEVIRTUAL@12)
  | IN java.lang.__Start__ (__Start__.java)
  |- .__base:()V @0 (:72 INVOKEINTERFACE@43)