问题
I am getting a Stackoverflow error on Java Console while opening the Applets over network on Java Version 8 build 1.8.0_45-b15 . The applet gets loaded but takes around 8 minutes and the same works fine in any of the Java 7 versions over the network .
Can anyone please help .. The stacktrace is as follows .
java.lang.StackOverflowError
at java.security.AccessController.doPrivileged(Native Method)
at sun.security.provider.PolicyFile.getPermissions(Unknown Source)
at sun.security.provider.PolicyFile.getPermissions(Unknown Source)
at sun.security.provider.PolicyFile.implies(Unknown Source)
at java.security.ProtectionDomain.implies(Unknown Source)
at java.security.AccessControlContext.checkPermission(U
回答1:
I have a similar problem and finding.
We are using an applet in Firefox. Current Testing versions:
- Firefox: 46.0.1
- Java: jre1.8.0_51 (32bit)
I used JFR (Java Flight Recorder) and Oracle Mission Control to analyse a long hang (about 5s) on startup of our UI.
My finding so far is that the method Permissions.implies() takes extremely long for an unknown reason.
My analysis showed 2 long blocked stacks for 2 different threads which both were hanging long (about 2s & 4s) in this method.
Here is one call stack that JMC isolated: (For reference: 4.340.000.123ns = 4.34s)
Stack Trace Count Duration (ns)
java.security.Permissions.implies(Permission) 1 4.340.000.123
sun.security.provider.PolicyFile.implies(ProtectionDomain, Permission) 1 4.340.000.123
java.security.ProtectionDomain.implies(Permission) 1 4.340.000.123
java.security.AccessControlContext.checkPermission(Permission) 1 4.340.000.123
java.security.AccessController.checkPermission(Permission) 1 4.340.000.123
java.lang.SecurityManager.checkPermission(Permission) 1 4.340.000.123
sun.plugin2.applet.AWTAppletSecurityManager.checkPermission(Permission) 1 4.340.000.123
java.lang.SecurityManager.hasAllPermission() 1 4.340.000.123
java.lang.SecurityManager.currentClassLoader() 1 4.340.000.123
sun.plugin2.applet.AWTAppletSecurityManager.getCurrentClassLoader() 1 4.340.000.123
sun.plugin2.applet.AWTAppletSecurityManager.getThreadGroup() 1 4.340.000.123
java.lang.Thread.init(ThreadGroup, Runnable, String, long, AccessControlContext) 1 4.340.000.123
java.lang.Thread.init(ThreadGroup, Runnable, String, long) 1 4.340.000.123
java.lang.Thread.<init>(String) 1 4.340.000.123
MyClass2.<init>() 1 4.340.000.123
MyClass.treatNew(Protocol) 1 4.340.000.123
MyClass.treatNewDecode(String, int) 1 4.340.000.123
MyClass.run() 1 4.340.000.123
java.lang.Thread.run() 1 4.340.000.123
来源：https://stackoverflow.com/questions/31055153/applets-loading-very-slow-on-java-8u-45-with-stack-overflow-error-while-it-works