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Hello,
I am trying to use a Runtime.exec() call from within a servlet, and it
promptly dies with a "500 - internal server error" message. It seems to die
right where it calls Runtime.exec().
Naturally, any suggestions are appreciated.
Thanks,
Tim
First, the rough details:
===========================================================================
JServ: Apache JServ 1.1b3 - 25 October 1999
Apache: 1.3
JVM: JDK 1.1.8 IBM build l118-19991013 (JIT disabled)
OS: Linux x86 (Debian "potato") kernel 2.2.10
===========================================================================
Next, the error log:
SIGSEGV received at bebff908 in
/usr/lib/ibm-java/jdk118/lib/linux/native_threads/libjava.so. Processing terminated
java full version "JDK 1.1.8 IBM build l118-19991013 (JIT disabled)"
args: /usr/lib/ibm-java/jdk118/bin/linux/native_threads/java -nojit
org/apache/jserv/JServ /etc/jserv/jserv.properties
Operating Environment
---------------------
Host : goibniu.(none)
OS Level : 2.2.10.#9 Wed Aug 11 13:09:41 CDT 1999
glibc Version : 2.1.2
No. of Procs : 1
Memory Info:
total: used: free: shared: buffers: cached:
Mem: 64700416 63762432 937984 22634496 1339392 15028224
Swap: 57798656 17817600 39981056
MemTotal: 63184 kB
MemFree: 916 kB
MemShared: 22104 kB
Buffers: 1308 kB
Cached: 14676 kB
SwapTotal: 56444 kB
SwapFree: 39044 kB
Application Environment
-----------------------
Signal Handlers -
SIGQUIT : ignored
SIGILL : sysThreadIDump (libjava.so)
SIGABRT : sysThreadIDump (libjava.so)
SIGFPE : sysThreadIDump (libjava.so)
SIGBUS : sysThreadIDump (libjava.so)
SIGSEGV : sysThreadIDump (libjava.so)
SIGPIPE : ignored
SIGUSR1 : doSuspendLoop (libjava.so)
Environment Variables -
PWD=/
HOSTNAME=goibniu
LD_LIBRARY_PATH=/usr/lib/ibm-java/jdk118/lib/linux/native_threads:
CLASSPATH=/usr/lib/jdk1.1/lib/classes.zip:/usr/share/java/ApacheJServ.jar:/usr/share/java/servlet-2.0.jar:/usr/share/java/gnujsp.jar:/usr/lib/ibm-java/jdk118/classes:/usr/lib/ibm-java/jdk118/lib/classes.jar:/usr/lib/ibm-java/jdk118/lib/rt.jar:/usr/lib/ibm-java/jdk118/lib/i18n.jar:/usr/lib/ibm-java/jdk118/lib/classes.zip
MACHTYPE=i486-pc-linux-gnu
JAVA_HOME=/usr/lib/ibm-java/jdk118
SHLVL=0
SHELL=/bin/sh
HOSTTYPE=i486
OSTYPE=linux-gnu
TERM=dumb
PATH=/bin:/usr/bin:/usr/local/bin
Current Thread Details
----------------------
"Thread-12" (TID:0x401f5fd0, sys_thread_t:0x815af70)
Native Thread State: ThreadID: 00001c08 Reuse: 1 DAEMON RUNNING
Native Stack Data : base: bebffd00 pointer bebc0954 used(258988) free(-11180)
----- Monitors held -----
----- Native stack -----
Java_java_lang_UNIXProcess_forkAndExec_stub
invokeNativeMethod
invokeLazyNativeMethod
__irem_trap5
------ Java stack ------ () prio=5 *current thread*
java.lang.UNIXProcess.<init>(UNIXProcess.java)
----------------------------------------------------------------------
Total Thread Count: 9
Active Thread Count: 9
JNI Thread Count: 0
Full thread dump:
"process reaper" (TID:0x401f5f98, sys_thread_t:0x8182610)
Native Thread State: ThreadID: 00002009 Reuse: 1 DAEMON SUSPENDED
Native Stack Data : base: be9ffd00 pointer be9ff8fc used(1028) free(246780)
----- Monitors held -----
----- Native stack -----
__pthread_mutex_unlock
pthread_cond_wait
sysThread_shell
pthread_detach
__clone
------ Java stack ------ () prio=5
----------------------------------------------------------------------
"Thread-12" (TID:0x401f5fd0, sys_thread_t:0x815af70)
Native Thread State: ThreadID: 00001c08 Reuse: 1 DAEMON RUNNING
Native Stack Data : base: bebffd00 pointer bebc0948 used(259000) free(-11192)
----- Monitors held -----
----- Native stack -----
Java_java_lang_UNIXProcess_forkAndExec_stub
invokeNativeMethod
invokeLazyNativeMethod
__irem_trap5
------ Java stack ------ () prio=5 *current thread*
java.lang.UNIXProcess.<init>(UNIXProcess.java)
----------------------------------------------------------------------
"Thread-10" (TID:0x401f6048, sys_thread_t:0x812bcb8)
Native Thread State: ThreadID: 00001807 Reuse: 6 DAEMON SUSPENDED
Native Stack Data : base: bedffd00 pointer bedfd78c used(9588) free(238220)
----- Monitors held -----
----- Native stack -----
pthread_cond_wait
java_lang_Runtime_execInternal
Java_java_lang_Runtime_execInternal_stub
invokeNativeMethod
invokeLazyNativeMethod
__irem_trap5
------ Java stack ------ () prio=5
java.lang.Runtime.exec(Runtime.java)
java.lang.Runtime.exec(Runtime.java)
test002.doGet(test002.java:30)
javax.servlet.http.HttpServlet.service(HttpServlet.java)
javax.servlet.http.HttpServlet.service(HttpServlet.java)
org.apache.jserv.JServConnection.processRequest(JServConnection.java:314)
org.apache.jserv.JServConnection.run(JServConnection.java:188)
java.lang.Thread.run(Thread.java)
----------------------------------------------------------------------
"Thread-4" (TID:0x401f6198, sys_thread_t:0x814ffc0)
Native Thread State: ThreadID: 00001406 Reuse: 1 DAEMON MONITOR WAIT
Native Stack Data : base: befffd00 pointer befff9e0 used(800) free(247008)
----- Monitors held -----
----- Native stack -----
sysMonitorWait
sysThreadSleep
threadSleep
java_lang_Thread_sleep
Java_java_lang_Thread_sleep_stub
invokeNativeMethod
__irem_trap5
------ Java stack ------ () prio=5
org.apache.jserv.JServServletManager.run(JServServletManager.java:998)
java.lang.Thread.run(Thread.java)
----------------------------------------------------------------------
"Thread-3" (TID:0x401f61d0, sys_thread_t:0x814add8)
Native Thread State: ThreadID: 00001005 Reuse: 1 DAEMON MONITOR WAIT
Native Stack Data : base: bf1ffd00 pointer bf1ff9c4 used(828) free(246980)
----- Monitors held -----
----- Native stack -----
sysMonitorWait
sysThreadSleep
threadSleep
java_lang_Thread_sleep
Java_java_lang_Thread_sleep_stub
invokeNativeMethod
invokeLazyNativeMethod
__irem_trap5
------ Java stack ------ () prio=5
org.apache.jserv.JServServletManager.run(JServServletManager.java:998)
java.lang.Thread.run(Thread.java)
----------------------------------------------------------------------
"Thread-2" (TID:0x401f6208, sys_thread_t:0x812c3e0)
Native Thread State: ThreadID: 00000c04 Reuse: 1 DAEMON MONITOR WAIT
Native Stack Data : base: bf3ffd00 pointer bf3ffa3c used(708) free(247100)
----- Monitors held -----
----- Native stack -----
sysMonitorWait
monitorWait - waiting on org.apache.java.util.SimpleQueue@401fb658
java_lang_Object_wait
Java_java_lang_Object_wait_stub
invokeNativeMethod
__irem_trap5
------ Java stack ------ () prio=1
java.lang.Object.wait(Object.java)
org.apache.java.util.SimpleQueue.waitObject(SimpleQueue.java:117)
org.apache.java.io.LogWriter$Agent.run(LogWriter.java:427)
----------------------------------------------------------------------
"Async Garbage Collector" (TID:0x401f6280, sys_thread_t:0x80a04b8)
Native Thread State: ThreadID: 00000803 Reuse: 1 DAEMON SUSPENDED
Native Stack Data : base: bf5ffd00 pointer bf5ffa30 used(720) free(247088)
----- Monitors held -----
----- Native stack -----
sysMonitorWait
sysThreadSleep
threadSleep
SetOrigArgs
sysThread_shell
pthread_detach
__clone
------ Java stack ------ () prio=1
----------------------------------------------------------------------
"Finalizer thread" (TID:0x401f62b8, sys_thread_t:0x80a0238)
Native Thread State: ThreadID: 00000402 Reuse: 1 DAEMON MONITOR WAIT
Native Stack Data : base: bf7ffd00 pointer bf7ffb68 used(408) free(247400)
----- Monitors held -----
----- Native stack -----
sysMonitorWait - waiting on Finalize me queue lock
finalizeOnExit
sysThread_shell
pthread_detach
__clone
------ Java stack ------ () prio=1
----------------------------------------------------------------------
"main" (TID:0x401f62f0, sys_thread_t:0x804a7a0)
Native Thread State: ThreadID: 00000400 Reuse: 1 USER PRIMORDIAL SUSPENDED
Native Stack Data : base: bffffaa0 pointer bffff60c used(1172) free(246636)
----- Monitors held -----
java.net.PlainSocketImpl@4025a5a8
----- Native stack -----
sysAcceptFD - FD: 13
java_net_PlainSocketImpl_socketAccept
Java_java_net_PlainSocketImpl_socketAccept_stub
__irem_trap5
------ Java stack ------ () prio=5
java.net.PlainSocketImpl.accept(PlainSocketImpl.java:379)
java.net.ServerSocket.implAccept(ServerSocket.java:198)
java.net.ServerSocket.accept(ServerSocket.java:181)
org.apache.java.net.AuthenticatedServerSocket.accept(AuthenticatedServerSocket.java:159)
org.apache.jserv.JServ.main(JServ.java:174)
----------------------------------------------------------------------
System Monitor Status
---------------------
Verifier lock: unowned.
Thread queue lock: unowned.
Name and type hash table lock: unowned.
String intern lock: unowned.
JNI pinning lock: unowned.
JNI global reference lock: unowned.
Zip lock: unowned.
BinClass lock: unowned.
Class loading lock: unowned.
Java stack lock: unowned.
Code rewrite lock: unowned.
Heap Lock: unowned.
Has finalization queue lock: unowned.
Finalize me queue lock: unowned.
Integer lock access-lock: unowned.
Monitor cache lock: unowned.
Monitor registry: unowned.
Object Monitor Status
---------------------
org.apache.java.util.SimpleQueue@401fb658: unowned
"Thread-2" (0x401f6208) waiting
java.net.PlainSocketImpl@4025a5a8: owner: "main"
org.apache.java.util.SimpleQueue@401fb658: unowned
"Thread-2" (0x401f6208) waiting
java.net.PlainSocketImpl@4025a5a8: owner: "main"
OK
[Wed Nov 17 15:23:59 1999] [error] [client 127.0.0.1] Premature end of script headers:
/devel/test002
[Wed Nov 17 15:23:59 1999] [emerg] JServ: ajp12[1]: cannot scan servlet headers (500)
[Wed Nov 17 15:23:59 1999] [error] JServ: an error returned handling request via
protocol "ajpv12"
===========================================================================
Next, my JServ config:
###############################################################################
# Apache JServ Configuration File #
###############################################################################
# Whether Apache must start Apache JServ or not (On=Manual Off=Autostart)
# Syntax: ApJServManual [on/off]
# Default: "Off"
ApJServManual Off
# Properties filename for Apache JServ in Automatic Mode.
# In manual mode this directive is ignored
# Syntax: ApJServProperties [filename]
# Default: "./conf/jserv.properties"
ApJServProperties /etc/jserv/jserv.properties
# Log file for this module operation relative to Apache root directory.
# Set the name of the trace/log file. To avoid possible confusion about
# the location of this file, an absolute pathname is recommended.
#
# This log file is different than the log file that is in the
# jserv.properties file. This is the log file for the C portion of Apache
# JServ.
#
# On Unix, this file must have write permissions by the owner of the JVM
# process. In other words, if you are running Apache JServ in manual mode
# and Apache is running as user nobody, then the file must have its
# permissions set so that that user can write to it.
# Syntax: ApJServLogFile [filename]
# Default: "./logs/mod_jserv.log"
# Note: when set to "DISABLED", the log will be redirected to Apache error log
# Debian note: DO NOT SET THIS OPTION HERE - use /etc/apache/httpd.conf!
#ApJServLogFile DISABLED
# Log Level for this module
# Syntax: ApJServLogLevel [debug|info|notice|warn|error|crit|alert|emerg]
# Default: info (unless compiled w/ JSERV_DEBUG, in which case it's debug)
ApJServLogLevel notice
# Protocol used by this host to connect to Apache JServ
# (see documentation for more details on available protocols)
# Syntax: ApJServDefaultProtocol [name]
# Default: "ajpv12"
ApJServDefaultProtocol ajpv12
# Default host on which Apache JServ is running
# Syntax: ApJServDefaultHost [hostname]
# Default: "localhost"
#ApJServDefaultHost java.apache.org
# Default port that Apache JServ is listening to
# Syntax: ApJServDefaultPort [number]
# Default: protocol-dependant (for ajpv12 protocol this is "8007")
ApJServDefaultPort 8007
# The amount of time to give to the JVM to start up as well
# as the amount of time to wait to ping the JVM to see if it
# is alive. Slow or heavily loaded machines might want to
# increase this value.
# Default: 10 seconds
# ApJServVMTimeout 10
# Passes parameter and value to specified protocol.
# Syntax: ApJServProtocolParameter [name] [parameter] [value]
# Default: NONE
# Note: Currently no protocols handle this. Introduced for future protocols.
# Apache JServ secret key file relative to Apache root directory.
# Syntax: ApJServSecretKey [filename]
# Default: "./conf/jserv.secret.key"
# Warning: if authentication is DISABLED, everyone on this machine (not just
# this module) may connect to your servlet engine and execute servlet
# bypassing web server restrictions. See the documentation for more information
ApJServSecretKey /etc/jserv/jserv.secret.key
# Mount point for Servlet zones
# (see documentation for more information on servlet zones)
# Syntax: ApJServMount [name] [jserv-url]
# Default: NONE
# Note: [name] is the name of the Apache URI path to mount jserv-url on
# [jserv-url] is something like "protocol://host:port/zone"
# If protocol, host or port are not specified, the values from
# "ApJServDefaultProtocol", "ApJServDefaultHost" or "ApJServDefaultPort"
# will be used.
# If zone is not specified, the zone name will be the first subdirectory of
# the called servlet.
# Example: "ApJServMount /servlets /myServlets"
# if user requests "http://host/servlets/TestServlet"
# the servlet "TestServlet" in zone "myServlets" on default host
# thru default protocol on defaul port will be requested
# Example: "ApJServMount /servlets ajpv12://localhost:8007"
# if user requests "http://host/servlets/myServlets/TestServlet"
# the servlet "TestServlet" in zone "myServlets" will be requested
# Example: "ApJServMount /servlets ajpv12://jserv.mydomain.com:15643/myServlets"
# if user requests "http://host/servlets/TestServlet" the servlet
# "TestServlet" in zone "myServlets" on host "jserv.mydomain.com" using
# "ajpv12" protocol on port "15643" will be executed
ApJServMount /servlets /root
ApJServMount /servlet /root
ApJServMount /devel /devel
ApJServMount /coolservlets /devel
# Whether <VirtualHost> inherits base host mount points or not
# Syntax: ApJServMountCopy [on/off]
# Default: "On"
# Note: This directive is meaninful only when virtual hosts are being used
ApJServMountCopy on
# Executes a servlet passing filename with proper extension in PATH_TRANSLATED
# property of servlet request.
# Syntax: ApJServAction [extension] [servlet-uri]
# Defaults: NONE
# Notes: This is used for external tools.
ApJServAction .jsp /servlets/org.gjt.jsp.JspServlet
#ApJServAction .gsp /servlets/com.bitmechanic.gsp.GspServlet
ApJServAction .jhtml /servlets/org.apache.servlet.ssi.SSI
#ApJServAction .xml /servlets/org.apache.cocoon.Cocoon
# Enable the Apache JServ status handler with the URL of
# "http://servername/jserv/" (note the trailing slash!)
# Change the "deny" directive to restrict access to this status page.
<Location /jserv/>
SetHandler jserv-status
order deny,allow
deny from all
allow from all
</Location>
############################## W A R N I N G ##################################
# Remember to disable or otherwise protect the execution of the Apache JServ #
# Status Handler (see right above) on a production environment since this may #
# give untrusted users the ability to obtain restricted information on your #
# servlets and their initialization arguments such as JDBC passwords and #
# other important information. The Apache JServ Status Handler should be #
# accessible only by system administrators. #
###############################################################################
===========================================================================
Finally, the offending code in question:
// package servlets;
/**
*
* @author
* @version
*/
import java.io.*;
import java.util.*;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import javax.servlet.*;
import javax.servlet.http.*;
public class test002 extends HttpServlet {
public void doGet(HttpServletRequest req, HttpServletResponse res) throws
ServletException, IOException
{
res.setContentType("text/html");
PrintWriter out = res.getWriter();
out.println("<HTML>");
out.println("<HEAD><TITLE>Hello World</TITLE></HEAD>");
out.println("<BODY>");
out.println("Now trying to run an external process:<br>");
String command = "/bin/uname";
Runtime runtime = Runtime.getRuntime();
Process proc = null;
try
{
proc = runtime.exec(command);
proc.waitFor();
BufferedReader in = new BufferedReader(new
InputStreamReader(proc.getInputStream()));
String line = null;
while ((line = in.readLine()) != null)
{
out.println(line + "<BR>");
}
}
catch (Exception e)
{
out.println("Problem!!");
}
out.println(command);
out.println("</BODY></HTML>");
}
}
===========================================================================
--
A language that doesn't have everything is actually easier to program
in than some that do.
-- Dennis M. Ritchie
--
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