Hi..... I'm the new guy.
I have an unusual problem. Hopefully somebody can at least tell me where to
begin looking. First, my environment: Red Hat Linux 7.3 Tomcat 4 JDK 1.4
I just have a simple little test servlet that makes a call to a native
library with JNI and then prints a little "hello" message back to my
browser. I general, it works fine... my method is called and I can text
back at the browser. However, if I send another request to the servlet
before the previous is finished (by hitting the refresh button twice fast),
Tomcat crashes and an error log is generated in the directory of my native
library.
HOWEVER! If I take out my PrintWriter calls and leave in my JNI stuff, then
I have NO problems... I can hit refresh as fast and as many times as I want.
And vice versa.... if I just leave in my PrintWriter stuff and take out my
JNI stuff, then I have no problems either.
It's *only* when the two are used and *only* when hit refresh 2 times or
more fast. It follows this pattern exactly. It's nothing random. Does
anybody have any idea where I can look? Is this a coding problem? Thread
problem? Tomcat problem? JDK problem? I just have no idea!
Thanks!!
---------------------------------------------------------------
Now a code snippet:
---------------------------------------------------------------
public class myclass extends HttpServlet {
static {
try {
System.loadLibrary("mylib");
} catch (UnsatisfiedLinkError e) {
e.printStackTrace();
}
}
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws IOException, ServletException {
PrintWriter out = response.getWriter();
libObj1 myLibObj1 = new libObj1("constructor"); // from C library
libObj2 myLibObj2 = myLibObj1.getThing(); // from C library
myLibObj2.myFunction(); // from C library
out.println("hello");
out.close();
}
------------------------------------------------
Some of the error log generated
----------------------------------------------
Unexpected Signal : 11 occurred at PC=0x40213833
Function=JVM_handle_linux_signal+0x93
Library=/usr/java/j2sdk1.4.0_01/jre/lib/i386/client/libjvm.so
Current Java thread:
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:92)
at java.net.SocketOutputStream.write(SocketOutputStream.java:126)
at
org.apache.catalina.connector.ResponseBase.flushBuffer(ResponseBase.java:674
)
at
org.apache.catalina.connector.HttpResponseBase.flushBuffer(HttpResponseBase.
java:764)
at
org.apache.catalina.connector.ResponseFacade.flushBuffer(ResponseFacade.java
:219)
at
org.apache.catalina.connector.ResponseStream.flush(ResponseStream.java:244)
at sun.nio.cs.StreamEncoder$CharsetSE.implFlush(StreamEncoder.java:409)
at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:150)
- locked <0x443dc0f0> (a java.io.OutputStreamWriter)
at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:213)
at java.io.PrintWriter.flush(PrintWriter.java:120)
- locked <0x443dc0f0> (a java.io.OutputStreamWriter)
at
org.apache.catalina.connector.ResponseWriter.flush(ResponseWriter.java:125)
at
org.apache.catalina.connector.ResponseBase.finishResponse(ResponseBase.java:
481)
at
org.apache.catalina.connector.HttpResponseBase.finishResponse(HttpResponseBa
se.java:237)
at
org.apache.catalina.connector.http.HttpResponseImpl.finishResponse(HttpRespo
nseImpl.java:287)
at
org.apache.catalina.connector.http.HttpProcessor.process(HttpProcessor.java:
1054)
at
org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.java:1125
)
at java.lang.Thread.run(Thread.java:536)
Dynamic libraries:
08048000-0804d000 r-xp 00000000 03:02 292710
/usr/java/j2sdk1.4.0_01/bin/java 0804d000-0804e000 rw-p 00004000 03:02
292710 /usr/java/j2sdk1.4.0_01/bin/java
40000000-40013000 r-xp 00000000 03:05 63490 /lib/ld-2.2.5.so
40013000-40014000 rw-p 00013000 03:05 63490 /lib/ld-2.2.5.so
.
.
.
... a bunch of stuff...
.
.
.
d635000-4d636000 rw-p 00004000 03:05 63501 /lib/libcrypt-2.2.5.so
4d65d000-4d66b000 r-xp 00000000 03:05 63535 /lib/libresolv-2.2.5.so
4d66b000-4d66c000 rw-p 0000e000 03:05 63535 /lib/libresolv-2.2.5.so
Local Time = Tue Jun 25 00:11:34 2002
Elapsed Time = 26
#
# HotSpot Virtual Machine Error : 11
# Error ID : 4F530E43505002D5
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Java VM: Java HotSpot(TM) Client VM (1.4.0_01-b03 mixed mode) #
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