Vagrant up fails on Windows 10 with VBoxManage.exe creating the host-only...
Bringing machine 'admin' up with 'virtualbox' provider...==> admin: Clearing any previously set network interfaces...There was an error while executing `VBoxManage`, a CLI used by Vagrantfor...
View ArticleToptal recruitment process
I have stumbled upon a couple of blog posts speaking very negatively about Toptal... I have (proudly) passed their first 2 stages of interviews - then I have decided to opt out because I prefer to...
View ArticleWebLogic CAT (classloader analysis tool) fails if the application under exam...
CAT encountered an error java.io.IOException: Could not locate: myapplication version: module: at...
View ArticleThe simplest possible Windows FTP server
http://www.sentex.net/~mwandel/ftpdmin/ ftpdmin .... if all you need is to have a colleague send you a big file which doesn't fit in an email, this utility is for you.... just remember to start it with...
View ArticleUCP and RAC
If you configure a Gridlink Datasource with the wrong ServiceName, you might get: java.sql.SQLException: Pool connect failed : java.lang.ClassCastException: java.lang.Boolean cannot be cast to...
View ArticleUseful JVM flags, revisited
This guy Patrick Peschlow (possibly a superhuman, a hero.... most likely a German, only Germans can love so much classifications) did an amazing job at illustrating all (most of) the JVM flags.He...
View Articlemonitoring remotely with jvisualvm and jstatd
If you run jstatd on a machine, you will get: ould not create remote objectaccess denied ("java.util.PropertyPermission""java.rmi.server.ignoreSubClasses""write")java.security.AccessControlException:...
View ArticleJava Mission Control, the Swiss Knife of Monitoring
I have extensively used JRockit Mission Control and really missed when I moved to Sun-JVM projects.... now that we use WebLogic 12 we have Java 1.7 (> u40) and so we can use Java Mission Control...
View ArticleInstalling JAD on Eclipse
GREAT instructions are here http://jadclipse.sourceforge.net/wiki/index.php/Main_Page.... more to come... Since I am behind corporate proxy, Eclipse Marketplace is blocked (as usual....)... so I had to...
View Articlecom/sun/xml/ws/client/WSServiceDelegate$DelegatingLoader filling up PERMGEN
If you invoke WS using SEI through jaxws-rt, you might encounter an issue where your PERM space is filled with instances of com/sun/xml/ws/client/WSServiceDelegate$DelegatingLoader and you get a...
View Articlejmap and userid
Reading on StackOverflow some people report issues when you take a heap profiling with jmap (jmap -dump or jmap -histo... NOT with jmap -heap) using root rather than actual user who started the JVM...
View Articlegchisto- analyzing GC patterns
git clone https://github.com/jewes/gchisto.git cd gchisto set JAVA_HOME=d:\pierre\Java\jdk1.7.0_79 d:\apps\apache-maven-3.3.3\bin\mvn clean install cd target java -jar gchisto-1.0.1-SNAPSHOT.jar beware...
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Playing with CAT and classloaders
I was reading the excellent Oracle document http://docs.oracle.com/middleware/1212/wls/WLPRG/classloading.htm#WLPRG320 on classloaders - very nice but it misses pictures and real data. So I have...
View ArticleVisual GC plugin for JVisualVM says "Not supported for this JVM"
For some local JVMs the Visual GC plugin (version 2.2.1) works, but for instance when I connect JVisualVM to itself I get "Not supported for this JVM" while all the rest works, also the MBean plugin...
View ArticleJVisualVM MBeans plugin fails with "Data not available because JMX connection...
If you get a "Data not available because JMX connection to the JMX agent could not be established" message on MBeans, try starting the monitored JVM with -Dcom.sun.management.jmxremote
View ArticleThe server name bla is unknown to the administration server
If you get this: weblogic.management.ManagementException: The server name bla is unknown to the administration server. Check if restart is required. at...
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Testing OVAB 12
I download OVAB_12.1.2.0.0_Appliance_v1.0.ova from http://www.oracle.com/technetwork/middleware/ovab/downloads/index.html?ssSourceSiteId=ocomen . Attempts to install the product from its installer...
View ArticleDigging in JNDI
JNDI is a bit of a mystery for me...whenever I get an exception like: javax.naming.NameNotFoundException: While trying to look up comp/env/jms/CF1 in /app/webapp/rocAdmin/1482669104.; remaining name...
View ArticleLync copy and paste nightmare
Very unfortunately I have to use Lync as a chat platform. Some stuff is pretty cool, but there are 2 TERRIBLE issues: one is that you select some text (ANY text), copy and paste (in any way you want)...
View ArticleWebLogic JNDIServiceLocator
Today there was a JNDI lookup failing across 2 clusters hosted on same machine but different NIC: WLS_FW.JNDIServiceLocator BEA-000000Error loading /somepath from...
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