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Singleton Timer in WebLogic
If you have a JEE EJB Timer in a Cluster, maybe you want only 1 instance to be active. In this case you should implement a Cluster Aware Singleton Component :...
View ArticleReferencing a WorkManager (ExecutorService) in a Web module or EJB module or...
at WAR level you can have a work-manager clause: https://docs.oracle.com/cd/E24329_01/web.1211/e21049/weblogic_xml.htm#WBAPP627but it's available also at EAR level:...
View ArticleNo shared spaces configured
Heapgarbage-first heap total 6291456K, used 1368757K [0x0000000640000000, 0x00000007c0000000, 0x00000007c0000000) region size 2048K, 97 young (198656K), 9 survivors (18432K)compacting perm gen total...
View ArticleApache http-client, customizing SSLSocketFactory
Here the general documentation on Apache HTTP client...
View ArticleWebLogic network-access-point
If you need to invoke operations (EJB, WS...) on a specific IP different from the main listen address / port of WLS, you can create inside config.xml a network-access-point and give it a mnemonic name...
View ArticleHacking users in WebLogic
vi $DOMAIN_HOME/security/DefaultAuthenticatorInit.ldift insert this: dn: uid=PIPPO,ou=people,ou=@realm@, dc=@domain@description: Test generated userobjectclass: inetOrgPersonobjectclass:...
View ArticleBEA-090171 and BEA-090169
in WebLogic there are 2 messages helping us identify the identity and trust store used : BEA-090171 Loading the identity certificate and private key stored under the alias client .... BEA-090169...
View ArticleORA-01031: insufficient privileges creating a JDBCStore
<Jun 8, 2016 9:12:41 AM CEST> <Error> <Store> <BEA-280072> <JDBC store "PIPPOJDBCStore" failed to open table...
View ArticleXAER_NOTA : The XID is not valid
If you get this error, most likely you need to tune your transaction timeoutS (there are many!) Look for Oracle Support documents "Recommended Timeout Configuration When Using an External Transaction...
View Articlejava.lang.OutOfMemoryError: GC overhead limit exceeded at...
Root cause of ServletException.java.lang.OutOfMemoryError: GC overhead limit exceeded at java.lang.Class.getDeclaredMethods0(Native Method) at...
View Articlereally cool way to determine which Threads are consuming more CPU
http://code.nomad-labs.com/2010/11/18/identifying-which-java-thread-is-consuming-most-cpu/this decimal to hex converter helps http://www.binaryhexconverter.com/decimal-to-hex-converter
View ArticleHow to educate yourself to be a Java Performance Engineer
Here is some articles that I found interesting and...
View ArticleLearning Java Security and JCA
Excellent working examples here http://www.java2s.com/Code/Java/Security/CatalogSecurity.htmJCA Tutorial http://docs.oracle.com/javase/7/docs/technotes/guides/security/crypto/CryptoSpec.htmlDebugging...
View ArticleJVM Parameters made easy
I have dreaming for many years of setting up such a tool: http://jvmmemory.com/ to provide a guided wizard to configure all aspects of JVM.... good to see that it's already there! Great job!
View ArticleEJB Timer stops working in WLS 12.1.3 after an exception occurs
On Version: WebLogic Server 12.1.3.0.0, Java 1.7.0_51 package com.pierre.timertest;import javax.ejb.Schedule;import javax.ejb.Stateless;import javax.ejb.Timer;@Statelesspublic class TimerTestEJB {...
View ArticleSSL TLS renegotiation, RFC 5746
Generalities: https://devcentral.f5.com/articles/ssl-profiles-part-6-ssl-renegotiation Oracle technical details on the famous RFC 5746, here the mythical JSEE Ref Guide (something every human should...
View Articlewhich Cipher Suites your JVM supports
"SunJSSE supports a large number of ciphersuites" http://docs.oracle.com/javase/6/docs/technotes/guides/security/SunProviders.html#SunJSSEProvider 1) WLS 11g (WLS 10.3.6) uses JSSE and runs on Java SE...
View ArticleTLS v1.2 support in Java 6
According to Oracle Doc: JDK 6 release supports TLS v1. See: http://docs.oracle.com/javase/6/docs/technotes/guides/security/SunProviders.html#SunJSSEProviderJDK 6 supports TLS 1.1 as well since JDK...
View ArticleHow to view your JVM default settings
cat Test.java public class Test { public static void main(String[] args) { for (;;) { } } } javac Test.java java -XX:+PrintCommandLineFlags Test you should get something like this:...
View ArticleWindowBuilder to build Swing client in Java
If you think Swing is bad, what about the endless mess that is Web UI development.... so we chose the lesser evil.... anyway UI technologies are one of the most Epic Failures in IT history, for they...
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