What I do is:
1. Download the log4jdbc4-1.2alpha2.jar, and put into $PE_HOME/jars
2. Download from SL4J the compress file: slf4j-1.5.8.tar.gz. Extract slf4j-api-1.5.8.jar and slf4j-simple-1.5.8.jar from the compress file, and put into $PE_HOME/jars
3. Modify $PE_HOME/conf/pe_dic.props, remark the old value and change the line:

#pe_dic.Url=jdbc:oracle:thin:@myoraclemachine:1521:PHDIC
pe_dic.Url=jdbc:log4jdbc:oracle:thin:@myoraclemachine:1521:PHDIC
#pe_dic.Driver=oracle.jdbc.driver.OracleDriver
pe_dic.Driver=net.sf.log4jdbc.DriverSpy

You’ll need to check your $PE_HOME/logs/pe_dic-server.log, to see the additional jdbc log messages.
Below is the snippet of the log file:

.........
11824 [main] INFO jdbc.audit - 1. Connection.isClosed() returned false
11824 [main] INFO jdbc.audit - 1. Statement.new Statement returned 
11824 [main] INFO jdbc.audit - 1. Connection.createStatement() returned net.sf.log4jdbc.StatementSpy@2e67cd84
11824 [main] INFO jdbc.sqlonly - SELECT upper(d.DATASTORE_NAME),c.DATABASE_S,c.DATABASE_NAME,c.TYPE,c.DRIVER,c.URL,c.TWO_TASK,c.SEQ_NAME,c.CLASS_NAME,c.PRIVATE 
FROM SLG_DATABASE c, SLG_DATASTORE d WHERE c.DATASTORE_S=d.DATASTORE_S ORDER BY d.DATASTORE_NAME,c.DATABASE_NAME 

11833 [main] INFO jdbc.sqltiming - SELECT upper(d.DATASTORE_NAME),c.DATABASE_S,c.DATABASE_NAME,c.TYPE,c.DRIVER,c.URL,c.TWO_TASK,c.SEQ_NAME,c.CLASS_NAME,c.PRIVATE 
FROM SLG_DATABASE c, SLG_DATASTORE d WHERE c.DATASTORE_S=d.DATASTORE_S ORDER BY d.DATASTORE_NAME,c.DATABASE_NAME 
 {executed in 9 msec}
11833 [main] INFO jdbc.resultset - 1. ResultSet.new ResultSet returned 
11833 [main] INFO jdbc.audit - 1. Statement.executeQuery(SELECT upper(d.DATASTORE_NAME),c.DATABASE_S,c.DATABASE_NAME,c.TYPE,c.DRIVER,c.URL,c.TWO_TASK,c.SEQ_NAME,c.CLASS_NAME,c.PRIVATE FROM SLG_DATABASE c, SLG_DATASTORE d WHERE c.DATASTORE_S=d.DATASTORE_S ORDER BY d.DATASTORE_NAME,c.DATABASE_NAME) returned net.sf.log4jdbc.ResultSetSpy@20e5ace9
11833 [main] INFO jdbc.resultset - 1. ResultSet.next() returned true
11833 [main] INFO jdbc.resultset - 1. ResultSet.getString(1) returned AOI_SHAPEFILE
11833 [main] INFO jdbc.resultset - 1. ResultSet.getString(2) returned 1263
11833 [main] INFO jdbc.resultset - 1. ResultSet.getString(3) returned AOI_SHAPEFILE
11833 [main] INFO jdbc.resultset - 1. ResultSet.getString(4) returned shapefile
11833 [main] INFO jdbc.resultset - 1. ResultSet.getString(5) returned dummy
11833 [main] INFO jdbc.resultset - 1. ResultSet.getString(6) returned dummy
11833 [main] INFO jdbc.resultset - 1. ResultSet.getString(7) returned dummy
11833 [main] INFO jdbc.resultset - 1. ResultSet.getString(8) returned seq
11833 [main] INFO jdbc.resultset - 1. ResultSet.getString(9) returned null
11833 [main] INFO jdbc.resultset - 1. ResultSet.getString(10) returned N
11833 [main] INFO jdbc.resultset - 1. ResultSet.next() returned true
.............

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

The problem happen when we try to install as a user which its home directory is not mounted. We tried to set the HOME to other directory by setting up HOME environment variable. But, we got:
No module find error

Then we try to debug the installation by:
sh -x setup.bin
It come back with a lot of debug messages, and at the end we will see a line with:
CLASSPATH=/tmp/install.829388/jar/...
exec /tmp/install.829388/jre/bin/java ....

What we did is to manipulate the user home by
$export CLASSPATH=/tmp/install.829388/jar/...
/tmp/install.829388/jre/bin/java -Duser.home=/tmp/tmpdir ...
This way, we will force the installer to use different HOME directory

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

As a reminder to myself, the LD_ASSUME_KERNEL should be set as:
# Set the LD_ASSUME_KERNEL environment variable only for Red Hat 9,
# RHEL AS 3, and RHEL AS 4 !!
# Use the "Linuxthreads with floating stacks" implementation instead of NPTL:
export LD_ASSUME_KERNEL=2.4.1 # for RH 9 and RHEL AS 3
export LD_ASSUME_KERNEL=export LD_ASSUME_KERNEL=2.4.19 # for RHEL AS 4
Honestly, I don’t know why we have to set differently between RH9 & RHEL AS 3 vs RHEL AS 4. I’ll do it anyway.

As I read from the Red Hat Release Notes, it says:
export LD_ASSUME_KERNEL=2.4.19 — Linuxthreads with floating stacks
export LD_ASSUME_KERNEL=2.2.5 — Linuxthreads without floating stacks

Once we set the environment, we can check which thread library that active, we can use ‘getconf GNU_LIBPTHREAD_VERSION’ command as follow:
bash-3.00$ unset LD_ASSUME_KERNEL
bash-3.00$ getconf GNU_LIBPTHREAD_VERSION
NPTL 2.3.4
bash-3.00$ export LD_ASSUME_KERNEL=2.4.1
bash-3.00$ getconf GNU_LIBPTHREAD_VERSION
linuxthreads-0.10
bash-3.00$ export LD_ASSUME_KERNEL=2.4.19
bash-3.00$ getconf GNU_LIBPTHREAD_VERSION
linuxthreads-0.10
bash-3.00$ export LD_ASSUME_KERNEL=2.5.2
bash-3.00$ getconf GNU_LIBPTHREAD_VERSION
NPTL 2.3.4
bash-3.00$ unset LD_ASSUME_KERNEL
bash-3.00$ getconf GNU_LIBPTHREAD_VERSION
NPTL 2.3.4

Information about NPTL can be found in wikipedia.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

I’ve to confess that I don’t have enough experience in Java Programming nor enough time to study. And it’s completely different beast compare to my other certifications (RHCE and OCP DBA) that merely IT infrastructure exams.

What I’ve done to get the certification is:
1. Learn about the SCJP it self. I print the page, and nail it to my office wall. So I can read the it whenever I’m in office.
2. Browse Amazon, try to find the best SCJP book available. Based on its reviews, I decided to buy Katherine Sierra SCJP Book. Because, I reside in The Netherlands, I ordered the book via bol.com, and received the book within 3 days.
3. Followed the book suggestion, I photo-copied the review part of each chapter. I read this when I’m on the tram on the way to and from office. I started to do this since October 2008.
4. On January 2009, I read the book completely. Finally!
5. But, my confident level still didn’t increase. Until, there’s information in the sun website that if we buy the voucher before June 2008, we’ll have a free retake exam. This boost my guts and also my learn.
6. I bought the Voucher from Sun NL. It cost 235 EUR + VAT.
7. I go to Prometric website, to register the exam. I chose the nearest exam location, which is 500 meter away from my office.
8. A day before the exam, I took a good night sleep. In the morning, I felt my self fresh, and went to exam location.
9. It’s a long exam, 3.5 hours! I used this full long time to do the exam 9 passes, until I ran out of time. After click finish, it didn’t show my result on the computer screen. It’s different with my OCP, that show the result as soon as you click finish. I went to the admin, and she congratulated me that I passed the exam. I still couldn’t believe it! Alhamdulillah!

Now, since I’ve passed the exam. I feel lighter, seems that the whole burden that I’d carried over years has gone. I need to decide for my next goal. I would like to get back to academic things, but I still don’t know how to do it, any idea?

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

The work around is to set IATEMPDIR environment to location that has sufficient space
$ export IATEMPDIR=/glb/apps/3rdparty_test/tmp

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

To remove this output, I temporarily redirect the output to ‘null’, as shown in snippet below:
private void connect() throws IOException
{
try {
PrintStream oriOut = System.out;
System.setOut(new PrintStream(new OutputStream(){public void write (int b){}}));
Class.forName("com.lgc.dam.phs.client.jdbc.PhsJDBCDriver");
if (connurl!=null) {
conn = DriverManager.getConnection(connurl);
} else {
conn = DriverManager.getConnection("jdbc:scwapi://"+phserver+"/"+pedic+"-"+rmiserver+";"+username+";"+password+";SYSTEM;SYSTEM");
}
System.setOut(oriOut);
} catch (Exception e) {
System.out.println(e.toString());
}
}


Using the ‘setOut’ to newly create empty OutputStream, it hides the output. After finish, ‘setOut’ to original OuputStream.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

We’re able to find the culprit thread. And by following the stack trace that produce by the thread, we’re able to find which user workflow that causing the thread gone wild.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

JConsole remotely monitors JMX-enable Java Apps

To enable JMX in PowerHub add lines below to $PE_HOME/bin/runServer:
-Dcom.sun.management.jmxremote \
-Dcom.sun.management.jmxremote.port=8024 \
-Dcom.sun.management.jmxremote.authenticate=true \
-Dcom.sun.management.jmxremote.ssl=false \

Notice:
1. JConsole is part of JDK default installation
2. “-Dcom.sun.management.jmxremote” is minimum parameter to enable JMX for local console. But this is not advisable.
3. Remote connect of JConsole can be achieve by setting the other three parameters
4. Remote connect use port. Each Java Application should be started with a separate port. e.g: 8001, 8002, 8003,…

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

-D -Djava.security.manager -Djava.security.policy="server.policy"

Then create a file in eclipse directory security.conf with the following values:
grant
{
permission java.security.AllPermission;
};
And then start your eclipse

This work is licensed under a Creative Commons Attribution 3.0 Unported License.

This work is licensed under a Creative Commons Attribution 3.0 Unported License.