我编写了JMTI代理，用于从app获取异常：
#include <jvmti.h>
#include <string.h>
void printStackTrace(JNIEnv* env, jobject exception) {
jclass throwable_class = (*env).FindClass("java/lang/Throwable");
jmethodID print_method = (*env).GetMethodID(throwable_class, "printStackTrace", "()V");
(*env).CallVoidMethod(exception, print_method);
}
static void frameToString(jvmtiEnv *jvmti, jvmtiFrameInfo *finfo)
{
jvmtiError error;
jclass klass;
char *signature;
char *methodname;
char *methodsig;
jboolean isNative;
char *filename;
int lineCount;
jvmtiLineNumberEntry*lineTable;
int lineNumber;
/* Initialize defaults */
klass = NULL;
signature = NULL;
methodname = NULL;
methodsig = NULL;
isNative = JNI_FALSE;
filename = NULL;
lineCount = 0;
lineTable = NULL;
lineNumber = 0;
/* Get jclass object for the jmethodID */
error = (*jvmti).GetMethodDeclaringClass(finfo->method, &klass);
/* Get the class signature */
error = (*jvmti).GetClassSignature(klass, &signature, NULL);
/* Get the name and signature for the method */
error = (*jvmti).GetMethodName(finfo->method, &methodname, &methodsig, NULL);
/* Check to see if it's a native method, which means no lineNumber */
error = (*jvmti).IsMethodNative(finfo->method, &isNative);
/* Get source file name */
error = (*jvmti).GetSourceFileName(klass, &filename);
if ( error != JVMTI_ERROR_NONE && error != JVMTI_ERROR_ABSENT_INFORMATION ) {
printf("%d \n", error);
}
/* Get lineNumber if we can */
if ( !isNative ) {
int i;
/* Get method line table */
error = (*jvmti).GetLineNumberTable(finfo->method, &lineCount, &lineTable);
if ( error == JVMTI_ERROR_NONE ) {
/* Search for line */
lineNumber = lineTable[0].line_number;
for ( i = 1 ; i < lineCount ; i++ ) {
if ( finfo->location < lineTable[i].start_location ) {
break;
}
lineNumber = lineTable[i].line_number;
}
}
}
/* Create string for this frame location.
* NOTE: These char* quantities are mUTF (Modified UTF-8) bytes
* and should actually be converted to the default system
* character encoding. Sending them to things like
* printf() without converting them is actually an I18n
* (Internationalization) error.
*/
printf("%s.%s@%d[%s:%d]\n", signature, methodname, (int)finfo->location, filename, lineNumber);
// /* Free up JVMTI space allocated by the above calls */
// deallocate(jvmti, signature);
// deallocate(jvmti, methodname);
// deallocate(jvmti, methodsig);
// deallocate(jvmti, filename);
// deallocate(jvmti, lineTable);
}
void JNICALL ExceptionCallback(jvmtiEnv* jvmti, JNIEnv* env, jthread thread,
jmethodID method, jlocation location, jobject exception,
jmethodID catch_method, jlocation catch_location) {
// int count;
// int line_number = 0;
// int i;
// char* class_name;
// char* method_name;
jvmtiFrameInfo frames[10];
jint count;
jint frame_count;
// jclass exception_class = (*env).GetObjectClass(exception);
// (*jvmti).GetClassSignature(exception_class, &class_name, NULL);
// (*jvmti).GetMethodName(method, &method_name, NULL, NULL);
// (*jvmti).GetSourceFileName()
//
// jvmtiLineNumberEntry *location_table;
// (*jvmti).GetLineNumberTable(method, &count, &location_table);
// for (i = 0; i < count - 1; i++)
// {
// jvmtiLineNumberEntry entry1 = location_table[i];
// jvmtiLineNumberEntry entry2 = location_table[i+1];
// if (location >= entry1.start_location && location < entry2.start_location)
// {
// line_number = entry1.line_number;
// break;
// }
// }
// if (location >= location_table[count-1].start_location)
// {
// line_number = location_table[count-1].line_number;
// }
//
// printf("%s %d \n", class_name, line_number);
(*jvmti).GetStackTrace(thread, (jint)0, (jint)10, (jvmtiFrameInfo *)&frames, &count);
frameToString(jvmti, frames);
printStackTrace(env, exception);
}
JNIEXPORT jint JNICALL Agent_OnLoad(JavaVM* vm, char* options, void* reserved) {
jvmtiEnv* jvmti;
jvmtiEventCallbacks callbacks;
jvmtiCapabilities capabilities;
(*vm).GetEnv((void**)&jvmti, JVMTI_VERSION_1_0);
memset(&capabilities, 0, sizeof(capabilities));
capabilities.can_generate_exception_events = 1;
capabilities.can_get_line_numbers = 1;
capabilities.can_get_source_file_name = 1;
// capabilities.can_suspend = 1;
(*jvmti).AddCapabilities(&capabilities);
memset(&callbacks, 0, sizeof(callbacks));
callbacks.Exception = ExceptionCallback;
(*jvmti).SetEventCallbacks(&callbacks, sizeof(callbacks));
(*jvmti).SetEventNotificationMode(JVMTI_ENABLE, JVMTI_EVENT_EXCEPTION, NULL);
return 0;
}
经过测试后。有一个奇怪的例外：
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:219)
at java.util.zip.ZipFile.<init>(ZipFile.java:149)
at java.util.jar.JarFile.<init>(JarFile.java:166)
at java.util.jar.JarFile.<init>(JarFile.java:103)
at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:893)
at sun.misc.URLClassPath$JarLoader.access$700(URLClassPath.java:756)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:838)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:831)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(URLClassPath.java:830)
at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:803)
at sun.misc.URLClassPath$3.run(URLClassPath.java:530)
at sun.misc.URLClassPath$3.run(URLClassPath.java:520)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:519)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:492)
at sun.misc.URLClassPath.getNextLoader(URLClassPath.java:457)
at sun.misc.URLClassPath.getResource(URLClassPath.java:211)
at java.net.URLClassLoader$1.run(URLClassLoader.java:365)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:304)
at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)
java.security.PrivilegedActionException: java.util.zip.ZipException: error in opening zip file
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(URLClassPath.java:830)
at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:803)
at sun.misc.URLClassPath$3.run(URLClassPath.java:530)
at sun.misc.URLClassPath$3.run(URLClassPath.java:520)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:519)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:492)
at sun.misc.URLClassPath.getNextLoader(URLClassPath.java:457)
at sun.misc.URLClassPath.getResource(URLClassPath.java:211)
at java.net.URLClassLoader$1.run(URLClassLoader.java:365)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:304)
at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)
Caused by: java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:219)
at java.util.zip.ZipFile.<init>(ZipFile.java:149)
at java.util.jar.JarFile.<init>(JarFile.java:166)
at java.util.jar.JarFile.<init>(JarFile.java:103)
at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:893)
at sun.misc.URLClassPath$JarLoader.access$700(URLClassPath.java:756)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:838)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:831)
... 20 more
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:219)
at java.util.zip.ZipFile.<init>(ZipFile.java:149)
at java.util.jar.JarFile.<init>(JarFile.java:166)
at java.util.jar.JarFile.<init>(JarFile.java:103)
at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:893)
at sun.misc.URLClassPath$JarLoader.access$700(URLClassPath.java:756)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:838)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:831)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(URLClassPath.java:830)
at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:803)
at sun.misc.URLClassPath$3.run(URLClassPath.java:530)
at sun.misc.URLClassPath$3.run(URLClassPath.java:520)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:519)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:492)
at sun.misc.URLClassPath.getNextLoader(URLClassPath.java:457)
at sun.misc.URLClassPath.getResource(URLClassPath.java:211)
at java.net.URLClassLoader$1.run(URLClassLoader.java:365)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:304)
at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)
java.security.PrivilegedActionException: java.util.zip.ZipException: error in opening zip file
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:519)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:492)
at sun.misc.URLClassPath.getNextLoader(URLClassPath.java:457)
at sun.misc.URLClassPath.getResource(URLClassPath.java:211)
at java.net.URLClassLoader$1.run(URLClassLoader.java:365)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:304)
at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)
Caused by: java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:219)
at java.util.zip.ZipFile.<init>(ZipFile.java:149)
at java.util.jar.JarFile.<init>(JarFile.java:166)
at java.util.jar.JarFile.<init>(JarFile.java:103)
at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:893)
at sun.misc.URLClassPath$JarLoader.access$700(URLClassPath.java:756)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:838)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:831)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(URLClassPath.java:830)
at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:803)
at sun.misc.URLClassPath$3.run(URLClassPath.java:530)
at sun.misc.URLClassPath$3.run(URLClassPath.java:520)
... 15 more
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:219)
at java.util.zip.ZipFile.<init>(ZipFile.java:149)
at java.util.jar.JarFile.<init>(JarFile.java:166)
at java.util.jar.JarFile.<init>(JarFile.java:103)
at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:893)
at sun.misc.URLClassPath$JarLoader.access$700(URLClassPath.java:756)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:838)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:831)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(URLClassPath.java:830)
at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:803)
at sun.misc.URLClassPath$3.run(URLClassPath.java:530)
at sun.misc.URLClassPath$3.run(URLClassPath.java:520)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:519)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:492)
at sun.misc.URLClassPath.getNextLoader(URLClassPath.java:457)
at sun.misc.URLClassPath.getResource(URLClassPath.java:211)
at java.net.URLClassLoader$1.run(URLClassLoader.java:365)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:304)
at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:219)
at java.util.zip.ZipFile.<init>(ZipFile.java:149)
at java.util.jar.JarFile.<init>(JarFile.java:166)
at java.util.jar.JarFile.<init>(JarFile.java:103)
at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:893)
at sun.misc.URLClassPath$JarLoader.access$700(URLClassPath.java:756)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:838)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:831)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(URLClassPath.java:830)
at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:803)
at sun.misc.URLClassPath$3.run(URLClassPath.java:530)
at sun.misc.URLClassPath$3.run(URLClassPath.java:520)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:519)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:492)
at sun.misc.URLClassPath.getNextLoader(URLClassPath.java:457)
at sun.misc.URLClassPath.getResource(URLClassPath.java:211)
at java.net.URLClassLoader$1.run(URLClassLoader.java:365)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:304)
at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)
java.security.PrivilegedActionException: java.util.zip.ZipException: error in opening zip file
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath$JarLoader.ensureOpen(URLClassPath.java:830)
at sun.misc.URLClassPath$JarLoader.<init>(URLClassPath.java:803)
at sun.misc.URLClassPath$3.run(URLClassPath.java:530)
at sun.misc.URLClassPath$3.run(URLClassPath.java:520)
at java.security.AccessController.doPrivileged(Native Method)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:519)
at sun.misc.URLClassPath.getLoader(URLClassPath.java:492)
at sun.misc.URLClassPath.getNextLoader(URLClassPath.java:457)
at sun.misc.URLClassPath.getResource(URLClassPath.java:211)
at java.net.URLClassLoader$1.run(URLClassLoader.java:365)
at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:411)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:304)
at sun.instrument.InstrumentationImpl.loadClassAndCallPremain(InstrumentationImpl.java:401)
Caused by: java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:219)
at java.util.zip.ZipFile.<init>(ZipFile.java:149)
at java.util.jar.JarFile.<init>(JarFile.java:166)
at java.util.jar.JarFile.<init>(JarFile.java:103)
at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:893)
at sun.misc.URLClassPath$JarLoader.access$700(URLClassPath.java:756)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:838)
at sun.misc.URLClassPath$JarLoader$1.run(URLClassPath.java:831)
... 20 more
为什么这个例外？怎么解决？