Glassfish reminder

./asadmin start-domain domain1
./asadmin list-jndi-entries
./asadmin stop-domain

crash Could not start CRaSSHD Failed to register BouncyCastle as the defaut JCE provider

Problem:

I deployed crash.war in JBoss and  I’ve the following error : Could not start CRaSSHD

10:22:31,335 INFO  [SSHPlugin] Booting SSHD
10:22:32,826 INFO  [SecurityUtils] Trying to register BouncyCastle as a JCE provider
10:22:36,861 SEVERE [SecurityUtils] Failed to register BouncyCastle as the defaut JCE provider
10:22:36,862 SEVERE [SSHLifeCycle] Could not start CRaSSHD

java.lang.RuntimeException: Failed to register BouncyCastle as the defaut JCE provider
…
Caused by: java.security.NoSuchProviderException: JCE cannot authenticate the provider BC
       at javax.crypto.SunJCE_b.a(DashoA13*..)
       at javax.crypto.KeyAgreement.getInstance(DashoA13*..)
       at org.apache.sshd.common.util.SecurityUtils$BouncyCastleRegistration.run(SecurityUtils.java:97)
       at org.apache.sshd.common.util.SecurityUtils.register(SecurityUtils.java:77)
       ... 79 more
Caused by: java.util.jar.JarException: Cannot parse jar:file:/opt/jboss/jboss-eap-5.1/jboss-as/server/all/deploy/crash.war!/WEB-INF/lib/bcprov-jdk16-1.46.jar

Solution :

- Download  bouncycastle library at http://www.bouncycastle.org/latest_releases.html (For me its bcprov-jdk15on-147.jar and bcprov-ext-jdk15on-147.jar).

- Copy theses files (eg: bcprov-jdk15on-147.jar and bcprov-ext-jdk15on-147.jar) in /path_to_your_jvm/jre/lib/ext. (e.g: /opt/jdk/jdk1.6.0_18/jre/lib/ext)
- vi /path_to_your_jvm/jre/lib/security/java.security and add the following line : security.provider.9=org.bouncycastle.jce.provider.BouncyCastleProvider

java.security

security.provider.1=sun.security.provider.Sun
security.provider.2=sun.security.rsa.SunRsaSign
security.provider.3=com.sun.net.ssl.internal.ssl.Provider
security.provider.4=com.sun.crypto.provider.SunJCE
security.provider.5=sun.security.jgss.SunProvider
security.provider.6=com.sun.security.sasl.Provider
security.provider.7=org.jcp.xml.dsig.internal.dom.XMLDSigRI
security.provider.8=sun.security.smartcardio.SunPCSC
security.provider.9=org.bouncycastle.jce.provider.BouncyCastleProvider

- Restart jboss.

http://www.randombugs.com/java/javalangsecurityexception-jce-authenticate-provider-bc.html
http://nyal.developpez.com/tutoriel/java/bouncycastle/#L1
http://julienviet.com/crash/

Java Puzzle

If you search exercises about JAVA which make think, go on http://wouter.coekaerts.be/2012/puzzle-dreams-solution

There are not easy and interesting exercises.

Creating a tar.gz file in Java

Creating a tar.gz file in Java

How to apply Checkstyle format automaticaly ?

Problem :


You want to format your code with checkstyle rule with CTRL-ALT-F.




Solution :


Right clic on the project -> Checkstyle -> Create a Formatter


Then go Windows -> Preferences -> Code Style -> Formatter 


Next, you just have to select the formatter you have created.
After that, you can make CTRL - ALT - F to format you code

java 1.8 lambda example

I saw at Devoxx France, a conference about java 1.8 and the use of lambdas by Guillaume Tardif. (http://www.devoxx.com/display/FR12/JDK+8+demo++lambdas+in+Action)

In this article, I will show you an example.You can dowload the jdk here : http://jdk8.java.net/lambda/

To install jdk1.8 on Ubunutu, you can do :


sudo mv ./jdk1.8.0 /usr/lib/jvm/
sudo update-alternatives --install “/usr/bin/java” “java” “/usr/lib/jvm/jdk1.8/bin/java” 1
sudo update-alternatives --install “/usr/bin/javac” “javac” “/usr/lib/jvm/jdk1.8/bin/javac” 1

sudo update-alternatives --config java

Then, you just have to choose the jdk.


Note : I have a bug when I use javac because javac -version show me always 1.6 and not 1.8
So to compile, I've done the following :

/usr/lib/jvm/jdk1.8.0/bin/javac Main.java
java Main

Here is my file Main.java:

import java.util.ArrayList;
import java.util.List;


public class Main {

public static void main(String[] args) {
List names = new ArrayList();
names.add("superman");
names.add("batman");
names.forEach( (String s) -> { System.out.println(s);} );
}

}

Then we show on the screen :

superman
batman


An other important point, Java 1.8 should support multiple inheritance !
If you have comment, post it !

Devoxx FRANCE

Tomorrow it's the beginning of a great conference.

During 3 days, there will be technical session on JAVA, HTML5, NOSQL, CASSANDRA ... et all new technologies !
Go to the web site to see trend of the moment devoxx