Name: vsR10008 Date: 10/15/2003



JVMTI spec for GetThreadInfo says:

typedef struct {
     char* name;
     jint priority;
     jboolean is_daemon;
     jthreadGroup thread_group;
     jobject context_class_loader;
} jvmtiThreadInfo;

jvmtiError
GetThreadInfo(jvmtiEnv* env,
             jthread thread,
             jvmtiThreadInfo* info_ptr)

...
+--------------------------------------------------------------------------------+
| jvmtiThreadInfo - Thread information structure |
+--------------------------+---------+-------------------------------------------+
| Field | Type | Description |
+--------------------------+---------+-------------------------------------------+
....
+--------------------------+---------+-------------------------------------------+
| context_class_loader | jobject | The context class loader associated with |
| | | this thread. |
+--------------------------+---------+-------------------------------------------+

But RI returns NULL in field "context_class_loader".

To reproduce this bug please run on Solaris the following sh script
(do not forget to change JDK_PATH var):

---- File: runme.sh ---------------------------------------------------
JDK_PATH="/java/re/jdk/1.5.0/latest/binaries/solaris-sparc"

JVMTI_H_PATH="${JDK_PATH}/include"
CC="cc"

echo "...creating a.c"
cat - > a.c <<EOF

#include <stdio.h>
#include "jvmti.h"

static jvmtiEnv *jvmti = NULL;

JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM *jvm, char *options, void *reserved) {
     jvmtiError err;
     jint res;

     res = (*jvm)->GetEnv(jvm, (void **) &jvmti,
           JVMTI_VERSION_1_0);

     if (res != JNI_OK || jvmti == NULL) {
         return JNI_ERR;
     }
     return JNI_OK;
}

JNIEXPORT void JNICALL
Java_a_check(JNIEnv *env, jclass cls, jthread thr, jobject clsl) {
     jvmtiError err;
     jvmtiThreadInfo info;

     err = (*jvmti)->GetThreadInfo(jvmti, thr, &info);
     if (err != JVMTI_ERROR_NONE) {
         printf("(GetThreadInfo) Error expected: %d, got: %d\n",
                 JVMTI_ERROR_NONE, err);
     }
     if ((*env)->IsSameObject(env, clsl, info.context_class_loader) != JNI_TRUE) {
         printf("Thread %s, wrong context class loader%s\n", info.name,
                      (info.context_class_loader == NULL ? ": NULL" : ""));
     }
}

EOF

echo "...creating liba.so"

${CC} -G -KPIC -o liba.so -I${JDK_PATH}/include -I${JDK_PATH}/include/solaris -I${JVMTI_H_PATH} a.c

echo "...creating a.java"

cat - > a.java <<EOF
public class a {
     native static void check(Thread thr, ClassLoader cl);
     public static void main(String args[]) {
         System.loadLibrary("a");
         Thread thr = new Thread("TEST");
         check(thr, thr.getContextClassLoader());
     }
}

EOF

echo "...creating a.class"

${JDK_PATH}/bin/javac -d . a.java

echo "...running a.class"
LD_LIBRARY_PATH=. CLASSPATH=. ${JDK_PATH}/bin/java -showversion -agentlib:a a
-----------------------------------------------------------------------

Running on b23, execution log is as follows:

----------------------------------------------------------------------
bash-2.03$ sh runme.sh
...creating a.c
...creating liba.so
...creating a.java
...creating a.class
...running a.class
java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b23)
Java HotSpot(TM) Client VM (build 1.5.0-beta-b23, mixed mode)

Thread TEST, wrong context class loader: NULL
----------------------------------------------------------------------

This bug is reproducible on builds 19-23 and affects JCK JVMTI test:
vm/jvmti/GetThreadInfo/gthi001/gthi00101/gthi00101.html

======================================================================