RFR(M): 8081674: EmptyStackException at startup if running with extended or unsupported charset
Mandy Chung
mandy.chung at oracle.com
Wed Jun 10 15:14:53 UTC 2015
Have you checked out this patch moving out findBuiltinLib from NativeLibrary class?
http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8081674/webrev.00/
Mandy
> On Jun 10, 2015, at 12:34 AM, Volker Simonis <volker.simonis at gmail.com> wrote:
>
> Mandy, the example/stacktrace I sent was with 8u.
>
> The problem isn't related to libzip, it is only the first library
> which gets loaded with System.loadLibrary().
>
> The problem will occur with every library which gets loaded by
> System.loadLibrary() because
> java.lang.ClassLoader$NativeLibrary.findBuiltinLib() always calls
> jni_FindClass() if we're running on a unsupported locale.
>
> On Tue, Jun 9, 2015 at 8:03 PM, Mandy Chung <mandy.chung at oracle.com> wrote:
>> Does my patch work fine on 8u? If it works fine, I prefer to get that
>> simple fix in 8u and take the time to have a better fix in 9 (jdk9 is still
>> under development and I have assumed that it's not a show stopper to you.
>> Let me know if it blocks you).
>>
>> A question to Sherman - do we have adequate tests to verify the move of
>> System.loadLibrary("zip") from system initialization to ZipFile
>> initialization for 8u?
>>
>> Mandy
>>
>>
>> On 06/09/2015 10:09 AM, Volker Simonis wrote:
>>>
>>> Hi Mandy,
>>>
>>> thanks for looking into this.
>>> Uunfortunately your fix only helps to fix "java -version" :(
>>>
>>> Running even a minimal HelloWorld will still fail with the following
>>> stack trace which is still caused by the same EmptyStackException:
>>>
>>> Error: A JNI error has occurred, please check your installation and try
>>> again
>>> Exception in thread "main" java.lang.ExceptionInInitializerError
>>> at sun.misc.Unsafe.ensureClassInitialized(Native Method)
>>> at
>>> sun.misc.SharedSecrets.getJavaUtilZipFileAccess(SharedSecrets.java:158)
>>> at sun.misc.URLClassPath$JarLoader.<clinit>(URLClassPath.java:765)
>>> 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.access$100(URLClassPath.java:64)
>>> at sun.misc.URLClassPath$1.next(URLClassPath.java:239)
>>> at sun.misc.URLClassPath$1.hasMoreElements(URLClassPath.java:250)
>>> at java.net.URLClassLoader$3$1.run(URLClassLoader.java:601)
>>> at java.net.URLClassLoader$3$1.run(URLClassLoader.java:599)
>>> at java.security.AccessController.doPrivileged(Native Method)
>>> at java.net.URLClassLoader$3.next(URLClassLoader.java:598)
>>> at java.net.URLClassLoader$3.hasMoreElements(URLClassLoader.java:623)
>>> at sun.misc.CompoundEnumeration.next(CompoundEnumeration.java:45)
>>> at
>>> sun.misc.CompoundEnumeration.hasMoreElements(CompoundEnumeration.java:54)
>>> at sun.misc.CompoundEnumeration.next(CompoundEnumeration.java:45)
>>> at
>>> sun.misc.CompoundEnumeration.hasMoreElements(CompoundEnumeration.java:54)
>>> at
>>> java.util.ServiceLoader$LazyIterator.hasNextService(ServiceLoader.java:354)
>>> at
>>> java.util.ServiceLoader$LazyIterator.hasNext(ServiceLoader.java:393)
>>> at java.util.ServiceLoader$1.hasNext(ServiceLoader.java:474)
>>> at java.nio.charset.Charset$1.getNext(Charset.java:350)
>>> at java.nio.charset.Charset$1.hasNext(Charset.java:365)
>>> at java.nio.charset.Charset$2.run(Charset.java:410)
>>> at java.nio.charset.Charset$2.run(Charset.java:407)
>>> at java.security.AccessController.doPrivileged(Native Method)
>>> at java.nio.charset.Charset.lookupViaProviders(Charset.java:406)
>>> at java.nio.charset.Charset.lookup2(Charset.java:477)
>>> at java.nio.charset.Charset.lookup(Charset.java:464)
>>> at java.nio.charset.Charset.isSupported(Charset.java:505)
>>> at
>>> sun.launcher.LauncherHelper.makePlatformString(LauncherHelper.java:580)
>>> Caused by: java.util.EmptyStackException
>>> at java.util.Stack.peek(Stack.java:102)
>>> at
>>> java.lang.ClassLoader$NativeLibrary.getFromClass(ClassLoader.java:1759)
>>> at java.lang.ClassLoader$NativeLibrary.findBuiltinLib(Native Method)
>>> at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1870)
>>> at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1843)
>>> at java.lang.Runtime.loadLibrary0(Runtime.java:870)
>>> at java.lang.System.loadLibrary(System.java:1122)
>>> at java.util.zip.ZipFile.<clinit>(ZipFile.java:86)
>>> ... 34 more
>>>
>>> It's obvious that the way jni_FindClass is looking for the class
>>> context by calling the NativeLibrary::getFromClass method is hacky but
>>> I think that the proposed fix is the quite simple and non-intrusive.
>>> And we probably don't want a complete rework of this code for 8
>>> anyway. So why not fix it the proposed way in 8 and 9 for now? That
>>> will still leave us time to come up with a better clean-up at least
>>> for 9.
>>>
>>> What do you think?
>>>
>>> Regards,
>>> Volker
>>>
>>> On Tue, Jun 9, 2015 at 1:35 AM, Mandy Chung <mandy.chung at oracle.com>
>>> wrote:
>>>>
>>>> Hi Volker,
>>>>
>>>> Your patch reminds me the question I have about loading zip library.
>>>>
>>>> In JDK 9 (and earlier release), zip library is loaded by the VM during
>>>> startup (see ClassLoader::load_zip_library). I think loadLibrary("zip")
>>>> is
>>>> no longer needed to be called from System::initializeSystemClass method
>>>> and
>>>> instead it can be loaded by java.util.zip.ZipFile static initializer.
>>>>
>>>> Do you mind to try the patch (below)? That may be a simpler fix.
>>>>
>>>> I never like the way jni_FindClass to look for the class context by
>>>> calling
>>>> the NativeLibrary::getFromClass method. I will have to look deeper other
>>>> alternative to clean that up. If taking out loadLibrary("zip") resolves
>>>> your issue, this will give us time to come up with a better clean-up in
>>>> the
>>>> future.
>>>>
>>>> Mandy
>>>> [1] https://bugs.openjdk.java.net/browse/JDK-4429040
>>>>
>>>> diff --git a/src/share/classes/java/lang/System.java
>>>> b/src/share/classes/java/lang/System.java
>>>> --- a/src/share/classes/java/lang/System.java
>>>> +++ b/src/share/classes/java/lang/System.java
>>>> @@ -1192,10 +1192,6 @@
>>>> setOut0(newPrintStream(fdOut,
>>>> props.getProperty("sun.stdout.encoding")));
>>>> setErr0(newPrintStream(fdErr,
>>>> props.getProperty("sun.stderr.encoding")));
>>>>
>>>> - // Load the zip library now in order to keep
>>>> java.util.zip.ZipFile
>>>> - // from trying to use itself to load this library later.
>>>> - loadLibrary("zip");
>>>> -
>>>> // Setup Java signal handlers for HUP, TERM, and INT (where
>>>> available).
>>>> Terminator.setup();
>>>>
>>>> diff --git a/src/share/classes/java/util/zip/ZipFile.java
>>>> b/src/share/classes/java/util/zip/ZipFile.java
>>>> --- a/src/share/classes/java/util/zip/ZipFile.java
>>>> +++ b/src/share/classes/java/util/zip/ZipFile.java
>>>> @@ -83,6 +83,7 @@
>>>>
>>>> static {
>>>> /* Zip library is loaded from System.initializeSystemClass */
>>>> + System.loadLibrary("zip");
>>>> initIDs();
>>>>
>>>> }
>>>>
>>>>
>>>>
>>>> On 06/08/2015 07:23 AM, Volker Simonis wrote:
>>>>>
>>>>> Hi,
>>>>>
>>>>> can I please get a review at least for the part of this fix which is
>>>>> common for jdk8 and jdk9. It's only a few lines in
>>>>> src/share/vm/prims/jni.cpp for the hotspot repository and one line
>>>>> src/java.base/share/classes/java/lang/ClassLoader.java for the jdk
>>>>> repository.
>>>>>
>>>>> Thanks,
>>>>> Volker
>>>>>
>>>>>
>>>>> On Tue, Jun 2, 2015 at 6:12 PM, Volker Simonis
>>>>> <volker.simonis at gmail.com>
>>>>> wrote:
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> can I please have review (and a sponsor) for these changes:
>>>>>>
>>>>>> https://bugs.openjdk.java.net/browse/JDK-8081674
>>>>>> http://cr.openjdk.java.net/~simonis/webrevs/2015/8081674.jdk
>>>>>> http://cr.openjdk.java.net/~simonis/webrevs/2015/8081674.hs
>>>>>>
>>>>>> Please notice that the fix requires synchronous changes in the jdk and
>>>>>> the
>>>>>> hotspot forest.
>>>>>>
>>>>>> The changes themselves are by far not that big as this explanation but
>>>>>> I
>>>>>> found the problem to be quite intricate so I tried to explain it as
>>>>>> good
>>>>>> as
>>>>>> I could. I'd suggest to read the HTML-formatted explanation in the
>>>>>> webrev
>>>>>> although the content is equal to the one in this mail:
>>>>>>
>>>>>> Using an unsupported character encoding (e.g. vi_VN.TCVN on Linux)
>>>>>> results
>>>>>> in an immediate VM failure with jdk 8 and 9:
>>>>>>
>>>>>> export LANG=vi_VN.TCVN
>>>>>> java -version
>>>>>> Error occurred during initialization of VM
>>>>>> java.util.EmptyStackException
>>>>>> at java.util.Stack.peek(Stack.java:102)
>>>>>> at
>>>>>> java.lang.ClassLoader$NativeLibrary.getFromClass(ClassLoader.java:1751)
>>>>>> at java.lang.ClassLoader$NativeLibrary.findBuiltinLib(Native
>>>>>> Method)
>>>>>> at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1862)
>>>>>> at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1835)
>>>>>> at java.lang.Runtime.loadLibrary0(Runtime.java:870)
>>>>>> at java.lang.System.loadLibrary(System.java:1119)
>>>>>> at java.lang.System.initializeSystemClass(System.java:1194)
>>>>>>
>>>>>> This is a consequence of "8005716: Enhance JNI specification to allow
>>>>>> support of static JNI libraries in Embedded JREs".
>>>>>>
>>>>>> With jdk 9 we get this error even if we're running with a supported
>>>>>> charset
>>>>>> which is in the ExtendedCharsets (as opposed to being in the
>>>>>> StandardCharsets) class which is a consequence of delegating the
>>>>>> loading
>>>>>> of
>>>>>> the ExtendedCharsets class to the ServiceLoader in jdk 9.
>>>>>>
>>>>>> export LANG=eo.iso-8859-3
>>>>>> output-jdk9/images/jdk/bin/java -version
>>>>>> Error occurred during initialization of VM
>>>>>> java.util.EmptyStackException
>>>>>> at java.util.Stack.peek(Stack.java:102)
>>>>>> at
>>>>>> java.lang.ClassLoader$NativeLibrary.getFromClass(ClassLoader.java:1737)
>>>>>> at java.lang.ClassLoader$NativeLibrary.findBuiltinLib(Native
>>>>>> Method)
>>>>>> at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1866)
>>>>>> at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1840)
>>>>>> at java.lang.Runtime.loadLibrary0(Runtime.java:874)
>>>>>> at java.lang.System.loadLibrary(System.java:1111)
>>>>>> at java.lang.System.initializeSystemClass(System.java:1186)
>>>>>>
>>>>>> Here's why the exception happens for an unsupported charset (see the
>>>>>> mixed
>>>>>> stack trace below for the full details):
>>>>>>
>>>>>> java.lang.System.loadLibrary() wants to load libzip.so. It calls
>>>>>> java.lang.Runtime.loadLibrary0() which at the very beginning calls the
>>>>>> native method ClassLoader$NativeLibrary.findBuiltinLib() which checks
>>>>>> if
>>>>>> the
>>>>>> corresponding library is already statically linked into the VM
>>>>>> (introduced
>>>>>> by 8005716).
>>>>>> Java_java_lang_ClassLoader_00024NativeLibrary_findBuiltinLib(),
>>>>>> the native implementation of findBuiltinLib() in Classloader.c calls
>>>>>> GetStringPlatformChars() to convert the library name into the native
>>>>>> platform encoding. GetStringPlatformChars() calls the helper function
>>>>>> jnuEncodingSupported() to check if the platform encoding which is
>>>>>> stored
>>>>>> in
>>>>>> the property "sun.jnu.encoding" is supported by Java.
>>>>>> jnuEncodingSupported()
>>>>>> is implemented as follows:
>>>>>>
>>>>>> static jboolean isJNUEncodingSupported = JNI_FALSE;
>>>>>> static jboolean jnuEncodingSupported(JNIEnv *env) {
>>>>>> jboolean exe;
>>>>>> if (isJNUEncodingSupported == JNI_TRUE) {
>>>>>> return JNI_TRUE;
>>>>>> }
>>>>>> isJNUEncodingSupported = (jboolean) JNU_CallStaticMethodByName (
>>>>>> env, &exe,
>>>>>> "java/nio/charset/Charset",
>>>>>> "isSupported",
>>>>>> "(Ljava/lang/String;)Z",
>>>>>> jnuEncoding).z;
>>>>>> return isJNUEncodingSupported;
>>>>>> }
>>>>>>
>>>>>> Once the function finds that the platform encoding is supported (by
>>>>>> calling
>>>>>> java.nio.charset.Charset.isSupported()) it caches this value and always
>>>>>> returns it on following calls. However if the platform encoding is not
>>>>>> supported, it ALWAYS calls java.nio.charset.Charset.isSupported() an
>>>>>> every
>>>>>> subsequent invocation.
>>>>>>
>>>>>> In order to call the Java method Charset.isSupported() (in
>>>>>> JNU_CallStaticMethodByName() in file jni_util.c), we have to call
>>>>>> jni_FindClass() to convert the symbolic class name
>>>>>> "java.nio.charset.Charset" into a class reference.
>>>>>>
>>>>>> But unfortunately, jni_FindClass() (from jni.cpp in libjvm.so) has a
>>>>>> special
>>>>>> handling if called from java.lang.ClassLoader$NativeLibrary to ensure
>>>>>> that
>>>>>> JNI_OnLoad/JNI_OnUnload are executed in the correct class context:
>>>>>>
>>>>>> instanceKlassHandle k (THREAD,
>>>>>> thread->security_get_caller_class(0));
>>>>>> if (k.not_null()) {
>>>>>> loader = Handle(THREAD, k->class_loader());
>>>>>> // Special handling to make sure JNI_OnLoad and JNI_OnUnload are
>>>>>> executed
>>>>>> // in the correct class context.
>>>>>> if (loader.is_null() &&
>>>>>> k->name() ==
>>>>>> vmSymbols::java_lang_ClassLoader_NativeLibrary()) {
>>>>>> JavaValue result(T_OBJECT);
>>>>>> JavaCalls::call_static(&result, k,
>>>>>> vmSymbols::getFromClass_name(),
>>>>>>
>>>>>> vmSymbols::void_class_signature(),
>>>>>> thread);
>>>>>> if (HAS_PENDING_EXCEPTION) {
>>>>>> Handle ex(thread, thread->pending_exception());
>>>>>> CLEAR_PENDING_EXCEPTION;
>>>>>> THROW_HANDLE_0(ex);
>>>>>> }
>>>>>>
>>>>>> So if that's the case and jni_FindClass() was reallycalled from
>>>>>> ClassLoader$NativeLibrary, then jni_FindClass() calles
>>>>>> ClassLoader$NativeLibrary().getFromClass() to find out the
>>>>>> corresponding
>>>>>> context class which is supposed to be saved there in a field of type
>>>>>> java.util.Stack named "nativeLibraryContext":
>>>>>>
>>>>>> // Invoked in the VM to determine the context class in
>>>>>> // JNI_Load/JNI_Unload
>>>>>> static Class<?> getFromClass() {
>>>>>> return ClassLoader.nativeLibraryContext.peek().fromClass;
>>>>>> }
>>>>>>
>>>>>> Unfortunately, "nativeLibraryContext" doesn't contain any entry at this
>>>>>> point and the invocation of Stack.peek() will throw the exception shown
>>>>>> before. In general, the "nativeLibraryContext" stack will be filled
>>>>>> later
>>>>>> on
>>>>>> in Runtime.loadLibrary0() like this:
>>>>>>
>>>>>> NativeLibrary lib = new NativeLibrary(fromClass, name, isBuiltin);
>>>>>> nativeLibraryContext.push(lib);
>>>>>> try {
>>>>>> lib.load(name, isBuiltin);
>>>>>> } finally {
>>>>>> nativeLibraryContext.pop();
>>>>>> }
>>>>>>
>>>>>> such that it always contains at least one element later when
>>>>>> jni_FindClass()
>>>>>> will be invoked.
>>>>>>
>>>>>> So in summary, the problem is that the implementors of 8005716 didn't
>>>>>> took
>>>>>> into account that calling ClassLoader$NativeLibrary.findBuiltinLib()
>>>>>> may
>>>>>> trigger a call to jni_FindClass() if we are running on a system with an
>>>>>> unsupported character encoding.
>>>>>>
>>>>>> I'd suggest the following fix for this problem:
>>>>>>
>>>>>> Change ClassLoader$NativeLibrary().getFromClass() to return null if the
>>>>>> stack is empty instead of throwing an exception:
>>>>>>
>>>>>> static Class<?> getFromClass() {
>>>>>> return ClassLoader.nativeLibraryContext.empty() ?
>>>>>> null : ClassLoader.nativeLibraryContext.peek().fromClass;
>>>>>> }
>>>>>>
>>>>>> Unfortunately this also requires a HotSpot change in jni_FindClass() in
>>>>>> order to properly handle the new 'null' return value:
>>>>>>
>>>>>> if (k.not_null()) {
>>>>>> loader = Handle(THREAD, k->class_loader());
>>>>>> // Special handling to make sure JNI_OnLoad and JNI_OnUnload are
>>>>>> executed
>>>>>> // in the correct class context.
>>>>>> if (loader.is_null() &&
>>>>>> k->name() ==
>>>>>> vmSymbols::java_lang_ClassLoader_NativeLibrary()) {
>>>>>> JavaValue result(T_OBJECT);
>>>>>> JavaCalls::call_static(&result, k,
>>>>>> vmSymbols::getFromClass_name(),
>>>>>>
>>>>>> vmSymbols::void_class_signature(),
>>>>>> thread);
>>>>>> if (HAS_PENDING_EXCEPTION) {
>>>>>> Handle ex(thread, thread->pending_exception());
>>>>>> CLEAR_PENDING_EXCEPTION;
>>>>>> THROW_HANDLE_0(ex);
>>>>>> }
>>>>>> oop mirror = (oop) result.get_jobject();
>>>>>> if (oopDesc::is_null(mirror)) {
>>>>>> loader = Handle(THREAD,
>>>>>> SystemDictionary::java_system_loader());
>>>>>> } else {
>>>>>> loader = Handle(THREAD,
>>>>>>
>>>>>>
>>>>>> InstanceKlass::cast(java_lang_Class::as_Klass(mirror))->class_loader());
>>>>>> protection_domain = Handle(THREAD,
>>>>>>
>>>>>>
>>>>>>
>>>>>> InstanceKlass::cast(java_lang_Class::as_Klass(mirror))->protection_domain());
>>>>>> }
>>>>>> }
>>>>>> } else {
>>>>>> // We call ClassLoader.getSystemClassLoader to obtain the system
>>>>>> class
>>>>>> loader.
>>>>>> loader = Handle(THREAD, SystemDictionary::java_system_loader());
>>>>>> }
>>>>>>
>>>>>> These changes are sufficient to solve the problem in Java 8.
>>>>>> Unfortunately,
>>>>>> that's still not enough in Java 9 because there the loading of the
>>>>>> extended
>>>>>> charsets has been delegated to ServiceLoader. But ServiceLoader calls
>>>>>> ClassLoader.getBootstrapResources() which calls
>>>>>> sun.misc.Launcher.getBootstrapClassPath(). This leads to another
>>>>>> problem
>>>>>> during class initialization of sun.misc.Launcher if running on an
>>>>>> unsupported locale.
>>>>>>
>>>>>> The first thing done in sun.misc.Launcher.<clinit> is the
>>>>>> initialisation
>>>>>> of
>>>>>> the bootstrap URLClassPath in the Launcher. However this initialisation
>>>>>> will
>>>>>> eventually call Charset.isSupported() and if we are running on an
>>>>>> unsupported locale this will inevitably end in another recursive call
>>>>>> to
>>>>>> ServiceLoader. But as explained below, ServiceLoader will query the
>>>>>> Launcher's bootstrap URLClassPath which will be still uninitialized at
>>>>>> that
>>>>>> point.
>>>>>>
>>>>>> So we'll have to additionally guard guard against this situation on JDK
>>>>>> 9
>>>>>> like this:
>>>>>>
>>>>>> private static Charset lookupExtendedCharset(String charsetName) {
>>>>>> if (!sun.misc.VM.isBooted() || // see
>>>>>> lookupViaProviders()
>>>>>> sun.misc.Launcher.getBootstrapClassPath() == null)
>>>>>> return null;
>>>>>>
>>>>>> This fixes the crashes, but still at the price of not having the
>>>>>> extended
>>>>>> charsets available during initialization until
>>>>>> Launcher.getBootstrapClassPath is set up properly. This may be still a
>>>>>> problem if the jdk is installed in a directory which contains
>>>>>> characters
>>>>>> specific to an extended encoding or if we have such characters in the
>>>>>> command line arguments.
>>>>>>
>>>>>> Thank you and best regards,
>>>>>> Volker
>>>>>>
>>>>>>
>>>>>> Mixed stack trace of the initial EmptyStackException for unsupported
>>>>>> charsets described before:
>>>>>>
>>>>>> Native frames: (J=compiled Java code, j=interpreted, Vv=VM code,
>>>>>> C=native
>>>>>> code)
>>>>>> j java.util.Stack.peek()Ljava/lang/Object;+1
>>>>>> j
>>>>>> java.lang.ClassLoader$NativeLibrary.getFromClass()Ljava/lang/Class;+3
>>>>>> v ~StubRoutines::call_stub
>>>>>> V [libjvm.so+0x9d279a] JavaCalls::call_helper(JavaValue*,
>>>>>> methodHandle*,
>>>>>> JavaCallArguments*, Thread*)+0x6b4
>>>>>> V [libjvm.so+0xcad591] os::os_exception_wrapper(void (*)(JavaValue*,
>>>>>> methodHandle*, JavaCallArguments*, Thread*), JavaValue*, methodHandle*,
>>>>>> JavaCallArguments*, Thread*)+0x45
>>>>>> V [libjvm.so+0x9d20cf] JavaCalls::call(JavaValue*, methodHandle,
>>>>>> JavaCallArguments*, Thread*)+0x8b
>>>>>> V [libjvm.so+0x9d1d3b] JavaCalls::call_static(JavaValue*,
>>>>>> KlassHandle,
>>>>>> Symbol*, Symbol*, JavaCallArguments*, Thread*)+0x139
>>>>>> V [libjvm.so+0x9d1e3f] JavaCalls::call_static(JavaValue*,
>>>>>> KlassHandle,
>>>>>> Symbol*, Symbol*, Thread*)+0x9d
>>>>>> V [libjvm.so+0x9e6588] jni_FindClass+0x428
>>>>>> C [libjava.so+0x20208] JNU_CallStaticMethodByName+0xff
>>>>>> C [libjava.so+0x21cae] jnuEncodingSupported+0x61
>>>>>> C [libjava.so+0x22125] JNU_GetStringPlatformChars+0x125
>>>>>> C [libjava.so+0xedcd]
>>>>>> Java_java_lang_ClassLoader_00024NativeLibrary_findBuiltinLib+0x8b
>>>>>> j
>>>>>>
>>>>>>
>>>>>> java.lang.ClassLoader$NativeLibrary.findBuiltinLib(Ljava/lang/String;)Ljava/lang/String;+0
>>>>>> j
>>>>>> java.lang.ClassLoader.loadLibrary0(Ljava/lang/Class;Ljava/io/File;)Z+4
>>>>>> j
>>>>>>
>>>>>>
>>>>>> java.lang.ClassLoader.loadLibrary(Ljava/lang/Class;Ljava/lang/String;Z)V+228
>>>>>> j
>>>>>> java.lang.Runtime.loadLibrary0(Ljava/lang/Class;Ljava/lang/String;)V+54
>>>>>> j java.lang.System.loadLibrary(Ljava/lang/String;)V+7
>>>>>> j java.lang.System.initializeSystemClass()V+113
>>>>>> v ~StubRoutines::call_stub
>>>>>> V [libjvm.so+0x9d279a] JavaCalls::call_helper(JavaValue*,
>>>>>> methodHandle*,
>>>>>> JavaCallArguments*, Thread*)+0x6b4
>>>>>> V [libjvm.so+0xcad591] os::os_exception_wrapper(void (*)(JavaValue*,
>>>>>> methodHandle*, JavaCallArguments*, Thread*), JavaValue*, methodHandle*,
>>>>>> JavaCallArguments*, Thread*)+0x45
>>>>>> V [libjvm.so+0x9d20cf] JavaCalls::call(JavaValue*, methodHandle,
>>>>>> JavaCallArguments*, Thread*)+0x8b
>>>>>> V [libjvm.so+0x9d1d3b] JavaCalls::call_static(JavaValue*,
>>>>>> KlassHandle,
>>>>>> Symbol*, Symbol*, JavaCallArguments*, Thread*)+0x139
>>>>>> V [libjvm.so+0x9d1e3f] JavaCalls::call_static(JavaValue*,
>>>>>> KlassHandle,
>>>>>> Symbol*, Symbol*, Thread*)+0x9d
>>>>>> V [libjvm.so+0xe3cceb] call_initializeSystemClass(Thread*)+0xb0
>>>>>> V [libjvm.so+0xe44444]
>>>>>> Threads::initialize_java_lang_classes(JavaThread*,
>>>>>> Thread*)+0x21a
>>>>>> V [libjvm.so+0xe44b12] Threads::create_vm(JavaVMInitArgs*,
>>>>>> bool*)+0x4a6
>>>>>> V [libjvm.so+0xa19bd7] JNI_CreateJavaVM+0xc7
>>>>>> C [libjli.so+0xa520] InitializeJVM+0x154
>>>>>> C [libjli.so+0x8024] JavaMain+0xcc
>>>>>>
>>>>>>
>>
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