Tagged: jdk
Making NetBeans detects JAVA_HOME
NetBeans’ configuration file contains following line.
# etc/netbeans.conf # netbeans_jdkhome="C:\Program Files\Java\jdkX.Y.Z_SOME" #
When you upgrade JDK, and possibly uninstall the older one, NetBeans starts asking about JDK.
Just comment the line out.
Uninstalling JDKs in OS X
$ cd /Library/Java/JavaVirtualMachines $ ls -1 jdk1.7.0_xx.jdk jdk1.7.0_xx.jdk jdk1.8.0_xx.jdk jdk1.8.0_xx.jdk $
$ pwd /Library/Java/JavaVirtualMachines $ sudo rm -rf jdk1.7.0_xx.jdk $
selecting javac with maven in command line
I just found that some of my company’s legacy codes doesn’t compile with JDK 8. And I just tried selecting the javac
executable in command line rather than changing maven-compiler-plugin
‘s configuration.
$ mvn -Dmaven.compiler.fork=true -Dmaven.compiler.executable=/path/to/jdk7/javac clean package
Note that, as documented, maven.compiler.fork
parameter must be true
.
Installing the StartCom CA Certificate into the local JDK
references
problem
I just found that my local JDK doesn’t like the StartSSL™‘s certificate on remote server.
He kept failing with following error while deploying site.
# Transfer error: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
solution
Download Tool Box/StartCom CA Certificates/StartCom Root CA (PEM encoded)
which is named ‘ca.pem’.
Then execute following script.
KEYSTORE=$JAVA_HOME/jre/lib/security/cacerts $JAVA_HOME/bin/keytool -import \ -alias StartCom-Root-CA \ -file ca.pem \ -keystore "$KEYSTORE"
When asked for password? changeit
.
installing latest oracle jdk in old ubuntu
add the repository
$ sudo add-apt-repository ppa:webupd8team/java
when
sudo: add-apt-repository: command not found
then
$ sudo apt-get install python-software-properties
update
$ sudo apt-get update
install
$ sudo apt-get install oracle-java7-installer $ sudo apt-get install oracle-java8-installer
switch
$ ls -1F /usr/lib/jvm/ java-7-oracle/ java-8-oracle/ $ update-java-alternatives -l java-7-oracle ... java-8-oracle ... $ sudo update-java-alternatives -s java-7-oracle $ java -version java version "1.7.x_yy" ... $ sudo update-java-alternatives -s java-8-oracle $ java -version java version "1.8.x_yy" ... $
switch along java_home
$ cat java7 #!/bin/sh alternative=java-7-oracle sudo update-java-alternatives -s $alternative export JAVA_HOME=/usr/lib/jvm/$alternative $ cat java8 #!/bin/sh alternative=java-7-oracle sudo update-java-alternatives -s $alternative export JAVA_HOME=/usr/lib/jvm/$alternative $ . java7;javac -version;echo $JAVA_HOME javac 1.7.x_yy /usr/lib/jvm/java-7-oracle $ . java8;javac -version;echo $JAVA_HOME javac 1.8.x_yy /usr/lib/jvm/java-8-oracle
if you want to remove the repository
$ sudo add-apt-repository ppa:webupd8team/java --remove
interesting…
export JAVA_HOME=$(dirname $(dirname $(readlink -e /usr/bin/javac))) export JAVA_HOME=$(readlink -f /usr/bin/javac | sed "s:/bin/javac::")