Java hangs

Hi all,
I am facing an issue in java.
Problem,
The sever stop responding to anything, it just hangs, cannot be restarted unless killing java process through task manager. does not respond to hprof, jstacktrace, jvisio, console, anything.
the problem occurs very intermittently, some time it works, some time it doesn't, so, very difficult keep track of this.
when tried to debugging, it seems to be hanging on creating a instance using constructor.newInstance() method.
Especially in sun.rmi.server.Util.createStub() method.
which is trying to create a stub object, it prints (sys.out.println) the loaded stub class and constructor also, but newInstance method hangs and do not print then onwards.
// sun.rmi.server.remote.Util.java
private static RemoteStub createStub(Class remoteClass, RemoteRef ref)
throws StubNotFoundException
String stubname = remoteClass.getName() + "_Stub";
try {
Class stubcl =
Class.forName(stubname, false, remoteClass.getClassLoader());
Constructor cons = stubcl.getConstructor(stubConsParamTypes);
return (RemoteStub) cons.newInstance(new Object[] { ref });
} catch {
it hangs here,, (RemoteStub) cons.newInstance(new Object[] { ref });
it is very intermittent, once for so many attempts,
Please help about the ways this can be debugged further or any solution to this.
Thanks,
Kalpa

If only it was as simple as making a post in a forum and then sitting back and waiting for answers.
But it is not. It will take plenty of smart people investigating every tiny little corner of the working environment to see where the problem may stem from. It starts by changing your attitude - it is too soon to claim that "java hangs". It might just as well be the OS that is blocking the process for some reason. You seem to have traced this to RMI, which opens network connections. Perhaps that is failing.
Check every log file available in the system, that is all I can say. If you must blame Java, try running with an alternate version (older and newer) to see if that changes anything. Create proof before you make claims.

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open("/root/store/jdk1.7.0_04/bin/../jre/lib/amd64/jli/x86_64/libpthread.so.0", O_RDONLY) = -1 ENOENT (No such file or directory)
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stat("/root/store/jdk1.7.0_04/bin/../jre/lib/amd64/jli", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
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close(3) = 0
open("/lib64/libpthread.so.0", O_RDONLY) = 3
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fstat(3, {st_mode=S_IFREG|0755, st_size=138328, ...}) = 0
mmap(NULL, 2208672, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f0bb6c0b000
mprotect(0x7f0bb6c22000, 2093056, PROT_NONE) = 0
mmap(0x7f0bb6e21000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x16000) = 0x7f0bb6e21000
mmap(0x7f0bb6e23000, 13216, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f0bb6e23000
close(3) = 0
open("/root/store/jdk1.7.0_04/bin/../jre/lib/amd64/jli/libjli.so", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0p\"\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=103718, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0bb7034000
mmap(NULL, 2187192, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f0bb69f5000
mprotect(0x7f0bb6a0b000, 2093056, PROT_NONE) = 0
mmap(0x7f0bb6c0a000, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x15000) = 0x7f0bb6c0a000
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mmap(NULL, 2109696, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f0bb67f1000
mprotect(0x7f0bb67f3000, 2097152, PROT_NONE) = 0
mmap(0x7f0bb69f3000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x2000) = 0x7f0bb69f3000
close(3) = 0
open("/root/store/jdk1.7.0_04/bin/../jre/lib/amd64/jli/libc.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/lib64/libc.so.6", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\360\355\1\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=1973416, ...}) = 0
mmap(NULL, 3803304, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f0bb6450000
mprotect(0x7f0bb65e7000, 2097152, PROT_NONE) = 0
mmap(0x7f0bb67e7000, 20480, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x197000) = 0x7f0bb67e7000
mmap(0x7f0bb67ec000, 18600, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f0bb67ec000
close(3) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0bb7033000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0bb7032000
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0bb7031000
arch_prctl(ARCH_SET_FS, 0x7f0bb7032700) = 0
mprotect(0x7f0bb67e7000, 16384, PROT_READ) = 0
mprotect(0x7f0bb69f3000, 4096, PROT_READ) = 0
mprotect(0x7f0bb6e21000, 4096, PROT_READ) = 0
mprotect(0x7f0bb7046000, 4096, PROT_READ) = 0
munmap(0x7f0bb7035000, 57891) = 0
set_tid_address(0x7f0bb70329d0) = 1688
set_robust_list(0x7f0bb70329e0, 0x18) = 0
futex(0x7fffffffd67c, FUTEX_WAKE_PRIVATE, 1) = 0
futex(0x7fffffffd67c, FUTEX_WAIT_BITSET_PRIVATE|FUTEX_CLOCK_REALTIME, 1, NULL, 7f0bb7032700) = -1 EAGAIN (Resource temporarily unavailable)
rt_sigaction(SIGRTMIN, {0x7f0bb6c10aa0, [], SA_RESTORER|SA_SIGINFO, 0x7f0bb6c1a4a0}, NULL, 8) = 0
rt_sigaction(SIGRT_1, {0x7f0bb6c10b30, [], SA_RESTORER|SA_RESTART|SA_SIGINFO, 0x7f0bb6c1a4a0}, NULL, 8) = 0
rt_sigprocmask(SIG_UNBLOCK, [RTMIN RT_1], NULL, 8) = 0
getrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0
brk(0) = 0x600b18
brk(0x621b18) = 0x621b18
brk(0x622000) = 0x622000
readlink("/proc/self/exe", "/root/store/jdk1.7.0_04/bin/java", 4096) = 32
access("/root/store/jdk1.7.0_04/lib/amd64/libjava.so", F_OK) = -1 ENOENT (No such file or directory)
access("/root/store/jdk1.7.0_04/jre/lib/amd64/libjava.so", F_OK) = 0
open("/root/store/jdk1.7.0_04/jre/lib/amd64/jvm.cfg", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=677, ...}) = 0
mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f0bb7043000
read(3, "# Copyright (c) 2003, Oracle and"..., 4096) = 677
read(3, "", 4096) = 0
close(3) = 0
munmap(0x7f0bb7043000, 4096) = 0
stat("/root/store/jdk1.7.0_04/jre/lib/amd64/server/libjvm.so", {st_mode=S_IFREG|0755, st_size=13498274, ...}) = 0
futex(0x7f0bb69f40ec, FUTEX_WAKE_PRIVATE, 2147483647) = 0
open("/root/store/jdk1.7.0_04/jre/lib/amd64/server/libjvm.so", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0P\223\31\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=13498274, ...}) = 0
mmap(NULL, 13757672, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f0bb5731000
mprotect(0x7f0bb6172000, 2093056, PROT_NONE) = 0
mmap(0x7f0bb6371000, 671744, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0xa40000) = 0x7f0bb6371000
mmap(0x7f0bb6415000, 240872, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f0bb6415000
close(3) = 0
open("/root/store/jdk1.7.0_04/bin/../jre/lib/amd64/jli/libm.so.6", O_RDONLY) = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=57891, ...}) = 0
mmap(NULL, 57891, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f0bb7035000
close(3) = 0
open("/lib64/libm.so.6", O_RDONLY) = 3
read(3, "\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0\240>\0\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=595800, ...}) = 0
mmap(NULL, 2633944, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f0bb54ad000
mprotect(0x7f0bb5530000, 2093056, PROT_NONE) = 0
mmap(0x7f0bb572f000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x82000) = 0x7f0bb572f000
close(3) = 0
mprotect(0x7f0bb572f000, 4096, PROT_READ) = 0
munmap(0x7f0bb7035000, 57891) = 0
mmap(NULL, 1052672, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS|MAP_STACK, -1, 0) = 0x7f0bb6f30000
mprotect(0x7f0bb6f30000, 4096, PROT_NONE) = 0
clone(child_stack=0x7f0bb702fff0, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0x7f0bb70309d0, tls=0x7f0bb7030700, child_tidptr=0x7f0bb70309d0) = 1689
futex(0x7f0bb70309d0, FUTEX_WAIT, 1689, NULL
================================================================

There is no official statement of certification for Java 8. We do support it, however, our stress testing is focused primary on Java 7.
--mark

Problem with Java after System Upgrade to 10.5.7

Hi,
I am facing problem with Java after having run Software upgrades.
Here is the whole story. I recently moved to iMac 10.5.6 from PowerPc 10.4. On this new machine I was having problem running a 3rd party application, which requires JVM. As this application worked well on Tiger, I decided to upgrade JVM on my iMAC using Software Upgrade(was I insane!!). As I like my systems to be updated (as with linux on my personal machine) I clicked "install all". As a result I have the following upgrades run on my machine:
2009-05-20 13:12:01 +0200: Installed "Mac OS X Update Combined" (10.5.7)
2009-05-20 13:12:10 +0200: Installed "Remote Desktop Client Update" (3.2.2)
2009-05-20 13:12:26 +0200: Installed "Java For Mac OS X 10.5 Update 2" (1.0)
2009-05-20 13:58:36 +0200: Installed "Java for Mac OS X 10.5 Update 3" (1.0)
2009-05-20 13:58:44 +0200: Installed "AirPort Utility Software Update 2009-001" (5.4.1)
2009-05-20 13:59:07 +0200: Installed "QuickTime" (7.6)
2009-05-20 13:59:22 +0200: Installed "iPhoto Update" (7.1.5)
2009-05-20 13:59:28 +0200: Installed "iLife Support" (9.0.2)
2009-05-20 13:59:38 +0200: Installed "iDVD Update" (7.0.3)
2009-05-20 13:59:58 +0200: Installed "iTunes" (8.1.1)
But now, simply running $ java on the prompt hangs, i.e. it takes no action.
$ which java
/usr/bin/java
$ ls -ltr /usr/bin/java
May 20 15:09 /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
$java (no response)
Here is the output of $ top
PID COMMAND %CPU TIME #TH #PRTS #MREGS RPRVT RSHRD RSIZE VSIZE
703 java 98.8% 0:38.54 3 110 72 480K 184K 1964K 40M
Any clues?
cheers

Hi man,
In the wake of this java problem I resorted to keep working on my old machine, and today in my spare time I tried to fix this new machine.
So I execute $java on prompt, and then try to check the files it has opened, using lsof -p pid
I see it referring to
/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Home/bin/java
isn't this usually the JAVA_HOME
However, executing $/System/Library/Frameworks/JavaVM.framework/Versions/1.5.0/Home/bin/java
hangs!!
but
$/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home/bin/java
works!!
$ pwd
/System/Library/Frameworks/JavaVM.framework/Versions/1.6/Home/bin
$ ./java -version
java version "1.6.0_07"
Java(TM) SE Runtime Environment (build 1.6.0_07-b06-153)
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_07-b06-57, mixed mode)
So, I changed the links as follows
borgraf:Versions raveesh$ l
total 72
drwxr-xr-x 3 root wheel 102 Mar 6 2008 1.3.1
lrwxr-xr-x 1 root wheel 3 May 21 19:42 1.4.1 -> 1.4
drwxr-xr-x 8 root wheel 272 May 21 19:42 1.6.0
lrwxr-xr-x 1 root wheel 3 May 21 19:44 OldCurrentJDK -> 1.5
lrwxr-xr-x 1 root wheel 5 May 21 19:44 1.4 -> 1.4.2
lrwxr-xr-x 1 root wheel 5 May 21 19:44 1.3 -> 1.3.1
lrwxr-xr-x 1 root wheel 5 May 21 19:44 1.5 -> 1.5.0
drwxr-xr-x 8 root wheel 272 May 21 19:44 1.4.2
drwxr-xr-x 8 root wheel 272 May 21 19:44 1.5.0
lrwxr-xr-x 1 root wheel 5 May 21 19:44 1.6 -> 1.6.0
lrwxr-xr-x 1 root wheel 1 May 21 19:44 OldCurrent -> A
drwxr-xr-x 8 root wheel 272 May 21 19:44 A
lrwxr-xr-x 1 root wheel 3 Jun 4 17:14 CurrentJDK -> 1.6
lrwxr-xr-x 1 root wheel 3 Jun 4 17:21 Current -> 1.6
Linking my Current and CurrentJDK to 1.6 and it works!
However, shall that be the reason!
what is in your /Versions/Current/
I got the following
$ ls /System/Library/Frameworks/JavaVM.framework/Versions/Current
CodeResources Frameworks JavaVM
Commands Headers Resources
There is no /Home in here, which is usually the case for /1.5 or /1.6
Anyways, things seems to work for the moment. Lets see if I get problem with using Java.
thanks

Pressing ENTER in Command Prompt to solve hanging

Hi,
Does anyone know why sometimes Java hangs, unless you press ENTER in the
Command Prompt for Windows 2K? After pressing ENTER it continues execution.
It happens with WebLogic sometimes too. It will not print anything on the
console until I press ENTER.
I'm sure lots of Java developers have experienced this weird problem.
Thanks,
Duke
[email protected]

That is what we call a "feature" of an enterprise-class OS ;-)
Peace,
Cameron Purdy
Tangosol Inc.
Tangosol Coherence: Clustered Coherent Cache for J2EE
Information at http://www.tangosol.com/
"Chad McDaniel" <[email protected]> wrote in message
news:[email protected]..
On windows machines be very careful to turn off the "mark" option in
the shell preferences. It can halt the server.
Daniel Hoppe <[email protected]> writes:
Hi,
because you marked something in the command prompt. Marking stops
execution. Enter means 'copy' and continues execution...
Daniel
-----Original Message-----
From: Duke Nguyen [mailto:[email protected]]
Posted At: Thursday, December 13, 2001 3:16 AM
Posted To: ejb
Conversation: pressing ENTER in Command Prompt to solve hanging
Subject: pressing ENTER in Command Prompt to solve hanging
Hi,
Does anyone know why sometimes Java hangs, unless you press
ENTER in the
Command Prompt for Windows 2K? After pressing ENTER it
continues execution.
It happens with WebLogic sometimes too. It will not print
anything on the
console until I press ENTER.
I'm sure lots of Java developers have experienced this weird problem.
Thanks,
Duke
[email protected]

Nw2004s java install failing at phase 3

Started installing JAVA on Red hat 4 with oracle 10g.
At phase 3, install common System file. Java hangs. At the botton of the GUi, I am seeing " creating profile for <SID> ......"
Here is the last few lines fromt the console
INFO       2007-12-05 16:16:37 [syuxccuren.cpp:264]
           CSyCurrentProcessEnvironmentImpl::setGroup(PSyGroup)
Real group id set to 201.
INFO       2007-12-05 16:16:37 [syuxccuren.cpp:543]
           CSyCurrentProcessEnvironmentImpl::setEffectiveGroup(PSyGroup)
Effective group id set to 55101.
Install hang and no progres after that
. Any help ?
Thanks!

Just wait... the status bar is not always updated, it will take a certain amount of time before it will progress.
You can check if the system is doing something by opening another terminal window and try a
top d1c
There you will see activity.
Markus

Java hangs

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