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Using jps and jstat with jboss
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created by <a href="https://community.jboss.org/people/willemnoorduin">Willem Noorduin</a> in <i>Beginner's Corner</i> - <a href="https://community.jboss.org/message/791429#791429">View the full discussion</a>
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<div class="jive-rendered-content"><p>We are trying to set up some basic monitoring with jps and jstat and we are running into a problem. For usage of these tools there is a hsperfdata_${user} directory created by the jvm, by default in /tmp. Only in our case, it is not created. Hence we cannot use jps, jstat or the other jvm tools. Some information:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>root@nlptc27b09:/tmp# cat /etc/redhat-release </p><p>Red Hat Enterprise Linux Server release 6.3 (Santiago)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>root@nlptc27b09:/tmp# uname -a</p><p>Linux nlptc27b09 2.6.32-279.11.1.el6.x86_64 #1 SMP Sat Sep 22 07:10:26 EDT 2012 x86_64 x86_64 x86_64 GNU/Linux</p><p>root@nlptc27b09:/tmp# /distr/jdk/bin/java -version</p><p>java version "1.6.0_27"</p><p>Java(TM) SE Runtime Environment (build 1.6.0_27-b07)</p><p>Java HotSpot(TM) Server VM (build 20.2-b06, mixed mode)</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>root@nlptc27b09:/tmp# ls -ls /tmp</p><p>total 16</p><p> 0 drwxr-xr-x. 2 root     root       40 Jan 14 07:21 hsperfdata_root</p><p>12 -rwxr-xr-x. 1 root     root     8630 Dec 13 15:30 iptables</p><p> 4 -rwxr-xr-x. 1 root     root      324 Dec 13 12:53 iptables-ctl.sh</p><p> 0 drwxr-xr-x. 2 wnoordui users      40 Dec 12 10:20 iptables.d</p><p> 0 drwx------. 2 root     root       40 Dec 18 11:46 mc-root</p><p> 0 drwx------. 2 wnoordui wnoordui   40 Dec  3 09:44 mc-wnoordui</p><p> 0 drwx------. 2 root     root       40 Nov 14 10:53 vmware-root</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>root@nlptc27b09:/tmp# ls -ld /tmp</p><p>drwxrwxrwt. 8 root root 200 Jan 14 07:18 /tmp</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>We are running jboss under a non-root user (as it should) named jboss.  We have tried the next things, with different results:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><ul><li style="text-align: start;">Running jboss under root. => Then the directory hsperdata_root is used and we get results (but you don't want that).</li><li style="text-align: start;">Putting <strong>-XX:+UsePerfData -Djava.io.tmpdir=/tmp </strong>as Java options => has no results (there is no hsperdata_jboss, in our case, created).</li><li style="text-align: start;">Switching to the last stable release of SUN/Oracle SDK => has no results (there is no hsperdata_jboss, in our case, created).</li><li style="text-align: start;">Switching to OpenJDK on Redhat => Now we get a /tmp/hsperfdata_jboss (but we don't want to use OpenJDK for our production JBoss).</li><li style="text-align: start;">Switching to another OS (Debian 6.0.6) and the same SUN JDK => Is working fine.</li><li style="text-align: start;">Putting <strong>-XX:+UsePerfData -Djava.io.tmpdir=/home/jboss/tmp</strong> (where this last directory is writeable by user jboss)  as Java options => has no results (there is no hsperdata_jboss, in our case, created).</li></ul><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p style="text-align: start;">I am communicating with Redhat on this, since the swritch from SUN to OpenJDK or/and Redhat to another Linux OS seemed to do the trick, but all I learned was that it might be a permission issue. But:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>root@nlptc27b09:/apps/jboss/test/configs# su - jboss</p><p>jboss@nlptc27b09:~$ cd /tmp</p><p>jboss@nlptc27b09:/tmp$ mkdir i-am-a-directory</p><p>jboss@nlptc27b09:/tmp$ touch i-am-a-directory/i-am-a-file</p><p>jboss@nlptc27b09:/tmp$ ls -lR i-am-a-directory/</p><p>i-am-a-directory/:</p><p>total 0</p><p>-rw-rw-r--. 1 jboss jboss 0 Jan 14 07:38 i-am-a-file</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>on Redhat says otherwise. Also, you can google all you want on this problem, all I found was ways to turn the perfstats off, not on. Can someone tell me where I went wrong ?  Also, the residental Linux Gurus on our team seems to point that this is really a java issue.</p></div>
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