Java MessageDigest.getInstance("MD5")挂起
Java MessageDigest.getInstance("MD5")挂起
提问于 2014-04-21 15:16:52
目前，我遇到了部署到OSX的Java代码的问题。根据我的调试日志，这一行：
m = MessageDigest.getInstance("MD5");有时就是执行不完。它不回来了。应用程序一直在消耗CPU。这在应用程序启动过程中非常早期，所以没有GUI窗口，但是已经有两个线程尝试执行md5散列--也许交互是以某种方式进行的？我从用户那里得到的唯一报告是“应用程序有时不会启动”。这是相当随机的，每10次发生3次左右。
这是已知的问题吗？我是不是用错误的方式初始化了什么东西？我注意到有人提到MessageDigest类不是threadsafe，但是将整个有问题的代码放在同步函数中并不能解决问题。有什么想法吗？
Java 1.6.0_45 64位，运行在MacOSX10.6.8上
编辑:根据奥列格的想法，我抓取了所有过程的堆栈痕迹：
"Thread-4" daemon prio=5 tid=1130d6000 nid=0x1006d8000 waiting for monitor entry [00000000]
java.lang.Thread.State: BLOCKED (on object monitor)
"AWT-Shutdown" prio=5 tid=113b1c000 nid=0x11b616000 in Object.wait() [11b615000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <7e1f45168> (a java.lang.Object)
at java.lang.Object.wait(Object.java:485)
at sun.awt.AWTAutoShutdown.run(AWTAutoShutdown.java:265)
- locked <7e1f45168> (a java.lang.Object)
at java.lang.Thread.run(Thread.java:680)
"AWT-AppKit" daemon prio=5 tid=1139db000 nid=0x7fff70596cc0 waiting for monitor entry [00000000]
java.lang.Thread.State: BLOCKED (on object monitor)
"Thread-1" prio=5 tid=113962000 nid=0x11b293000 waiting for monitor entry [11b290000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.lang.Runtime.loadLibrary0(Runtime.java:815)
- waiting to lock <7e1e04f80> (a java.lang.Runtime)
at java.lang.System.loadLibrary(System.java:1045)
at sun.security.pkcs11.wrapper.PKCS11$1.run(PKCS11.java:88)
at java.security.AccessController.doPrivileged(Native Method)
at sun.security.pkcs11.wrapper.PKCS11.<clinit>(PKCS11.java:86)
at sun.security.pkcs11.SunPKCS11.<init>(SunPKCS11.java:281)
at sun.security.pkcs11.SunPKCS11.<init>(SunPKCS11.java:86)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at sun.security.jca.ProviderConfig$4.run(ProviderConfig.java:262)
at java.security.AccessController.doPrivileged(Native Method)
at sun.security.jca.ProviderConfig.doLoadProvider(ProviderConfig.java:244)
at sun.security.jca.ProviderConfig.getProvider(ProviderConfig.java:224)
- locked <7e1e3a020> (a sun.misc.Launcher$AppClassLoader)
at sun.security.jca.ProviderList.getProvider(ProviderList.java:215)
at sun.security.jca.ProviderList.getService(ProviderList.java:313)
at sun.security.jca.GetInstance.getInstance(GetInstance.java:140)
at java.security.Security.getImpl(Security.java:659)
at java.security.MessageDigest.getInstance(MessageDigest.java:129)
at pl.gizarma.starter2.util.MD5.getMD5Bytes(MD5.java:23)
- locked <7fb495f30> (a java.lang.Class for pl.gizarma.starter2.util.MD5)
at pl.gizarma.starter2.util.MD5.fromBytes(MD5.java:14)
at pl.gizarma.starter2.util.MD5.fromString(MD5.java:9)
at pl.gizarma.starter2.net.UrlCache.getUrl(UrlCache.java:69)
- locked <7e1fb2600> (a pl.gizarma.starter2.net.UrlCache)
at pl.gizarma.starter2.net.UrlCache.getUrl(UrlCache.java:61)
at pl.gizarma.starter2.net.RetryingUrlReader.readUseCache(RetryingUrlReader.java:75)
at pl.gizarma.starter2.net.RetryingUrlReader.read(RetryingUrlReader.java:60)
at pl.gizarma.starter2.net.UpdateDownloader.download(UpdateDownloader.java:29)
at pl.gizarma.starter2.job.UpdateJob.run(UpdateJob.java:20)
at pl.gizarma.starter2.Starter2Main$1.run(Starter2Main.java:51)
"Low Memory Detector" daemon prio=5 tid=113035000 nid=0x11af39000 runnable [00000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread1" daemon prio=9 tid=113034800 nid=0x11ae36000 waiting on condition [00000000]
java.lang.Thread.State: RUNNABLE
"C2 CompilerThread0" daemon prio=9 tid=113033800 nid=0x11ad33000 waiting on condition [00000000]
java.lang.Thread.State: RUNNABLE
"Signal Dispatcher" daemon prio=9 tid=113033000 nid=0x11ac30000 waiting on condition [00000000]
java.lang.Thread.State: RUNNABLE
"Surrogate Locker Thread (Concurrent GC)" daemon prio=5 tid=113032000 nid=0x11ab2d000 waiting on condition [00000000]
java.lang.Thread.State: RUNNABLE
"Finalizer" daemon prio=8 tid=11387d000 nid=0x11aa2a000 in Object.wait() [11aa29000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <7e1e01300> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118)
- locked <7e1e01300> (a java.lang.ref.ReferenceQueue$Lock)
at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:134)
at java.lang.ref.Finalizer$FinalizerThread.run(Finalizer.java:171)
"Reference Handler" daemon prio=10 tid=113029000 nid=0x11a7cb000 in Object.wait() [11a7ca000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
- waiting on <7e1e011d8> (a java.lang.ref.Reference$Lock)
at java.lang.Object.wait(Object.java:485)
at java.lang.ref.Reference$ReferenceHandler.run(Reference.java:116)
- locked <7e1e011d8> (a java.lang.ref.Reference$Lock)
"main" prio=5 tid=113800800 nid=0x1017fb000 runnable [1017f8000]
java.lang.Thread.State: RUNNABLE
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1827)
- locked <7e1e010a8> (a java.util.Vector)
- locked <7e1e01100> (a java.util.Vector)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1724)
at java.lang.Runtime.loadLibrary0(Runtime.java:823)
- locked <7e1e04f80> (a java.lang.Runtime)
at java.lang.System.loadLibrary(System.java:1045)
at sun.security.action.LoadLibraryAction.run(LoadLibraryAction.java:50)
at java.security.AccessController.doPrivileged(Native Method)
at sun.awt.NativeLibLoader.loadLibraries(NativeLibLoader.java:38)
at sun.awt.DebugHelper.<clinit>(DebugHelper.java:29)
at java.awt.Component.<clinit>(Component.java:566)
at pl.gizarma.starter2.Starter2Main.prepareMainFrame(Starter2Main.java:23)
at pl.gizarma.starter2.Starter2Main.main(Starter2Main.java:17)
"VM Thread" prio=9 tid=113024800 nid=0x11a927000 runnable
"Gang worker#0 (Parallel GC Threads)" prio=9 tid=113802000 nid=0x112dc4000 runnable
"Gang worker#1 (Parallel GC Threads)" prio=9 tid=113802800 nid=0x112ec7000 runnable
"Concurrent Mark-Sweep GC Thread" prio=9 tid=11384d000 nid=0x11a498000 runnable
"VM Periodic Task Thread" prio=10 tid=113897000 nid=0x11b03c000 waiting on condition
"Exception Catcher Thread" prio=10 tid=113801800 nid=0x112c01000 runnable
JNI global references: 1004
Heap
par new generation total 19136K, used 3772K [7e1e00000, 7e32c0000, 7e4790000)
eden space 17024K, 22% used [7e1e00000, 7e21af1b8, 7e2ea0000)
from space 2112K, 0% used [7e2ea0000, 7e2ea0000, 7e30b0000)
to space 2112K, 0% used [7e30b0000, 7e30b0000, 7e32c0000)
concurrent mark-sweep generation total 63872K, used 0K [7e4790000, 7e85f0000, 7fae00000)
concurrent-mark-sweep perm gen total 21248K, used 7162K [7fae00000, 7fc2c0000, 800000000)引用的MessageDigest.getInstance("MD5")导致了System.loadLibrary，它正在“等待锁定<7e1e04f80>”。7e1e04f80被不同的System.loadLibrary调用锁定--从java.awt.Component开始，这意味着或多或少超出了我的控制范围。锁定线程正在执行本机例程$NativeLibrary.load，该程序似乎已挂起。我不知道里面装的是什么图书馆。
有什么想法吗？
回答 1
Stack Overflow用户
发布于 2014-05-02 21:46:48
从堆叠的痕迹
"Thread-1“等待监视器条目11b290000 java.lang.Thread.State:阻塞(在对象监视器上)在java.lang.System.loadLibrary(System.java:1045) at sun.security.pkcs11.wrapper.PKCS11$1.run(PKCS11.java:88) -等待锁定<7e1e04f80> (a java.lang.Runtime)
PKCS#11是一个模块标准，通常用于访问SmartCards和其他硬件加密设备。看起来，您的应用程序在加载PKCS#11模块时挂起。PKCS#11驱动程序是由第三方提供的，我很抱歉地说，但在我的经验中，经常是错误和不稳定的。如果您的应用程序不需要访问密码硬件，我建议禁用PKCS#11。
for(Provider p: Security.getProviders())
if(p instanceof sun.security.pkcs11.SunPKCS11)
Security.removeProvider(p.getName());另请参阅：
- http://docs.oracle.com/javase/7/docs/technotes/guides/security/p11guide.html
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/23200186
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