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the operation. Then download the tar.gz package for the corresponding JDK, and put it in:/var/cache/oracle-jdk7-installer (JDK7)/var/cache/oracle-jdk8-installer (JDK8)Below, and then install the installer once. Installer will use the TAR.GZ package you downloaded by default3. Set the system default JDKJDk7sudo update-java-alternatives-s java-7-oracleJDK8sudo update-java-alternatives-s java-8-oracleIf the J

corresponding JDK, and put it in:/var/cache/oracle-jdk7-installer (JDK7)/var/cache/oracle-jdk8-installer (JDK8)Below, and then install the installer once. Installer will use the TAR.GZ package you downloaded by default3. Set the system default JDKJDk7sudo update-java-alternatives-s java-7-oracleJDK8sudo update-java-alternatives-s java-8-oracleIf the JDK7 is installed and the JDK8 is installed, to switch be

installer because of a firewall or some other reason, you can interrupt the operation. then download the corresponding JDK tar.gz package, put in: /var/cache/oracle-jdk7-installer (JDK7) /var/cache/oracle-jdk8-installer (JDK8) Below, and then install the installer once. Installer will default to use the tar.gz package you downloaded 3. Set system default JDK JDk7 sudo update-java-alternatives-s java-7-oracle JDK8 sudo update-java-

1: Installed through the PPA (source) mode. 2: Download the installation package through the official website. 1th is recommended here because the JDK upgrade can be easily obtained by Apt-get upgrade method. install using the ppa/source method Add PPA sudo add-apt-repository ppa:webupd8team/java sudo apt-get update Install Oracle-java-installer Jdk7: sudo apt-get install oracle-java7-installer jdk8: sudo apt-get install Oracle-java8-installer The installer will prompt you to agree to Oracle

individual)If you cause installer to download slowly due to firewalls or other reasons, you can interrupt the operation. Then download the tar.gz package for the corresponding JDK, and put it in:/var/cache/oracle-jdk7-installer (JDK7)/var/cache/oracle-jdk8-installer (JDK8)Below, and then install the installer once. Installer will use the TAR.GZ package you downloaded by default3. Set the system default JDKJDk7sudo update-java-alternatives-s java-7-or

dashboard is similar to Twitter time Axis, users can see the real-time updates of all the users they are concerned about. Unlike blogging, caching does not work as much, because each request is different, especially for active followers. and need real-time and consistent, the article updates only 50GB daily, thread update 2.7TB every day, all the multimedia data are stored in the S3 above. Most users use Tumblr as a content browsing tool, browsing more than 500 million pages a day, and 70%

Preparation: JBoss, JDK, a Java EE War pack, DockerfileNote: JBoss and JDK can not be prepared in advance, wget in the command, because I happen to have, directly copiedDockerfile content:#admln 20150120From ubuntu:14.04Maintainer admln RUN Mkdir/usr/jbossCOPY wildfly-8.2.0.final/usr/jboss/COPY javaeedocker.war/usr/jboss/standalone/deployments/RUN mkdir/usr/java/COPY jdk-7u71-linux-x64.tar.gz/usr/java/workdir/usr/java/RUN TAR-ZXF jdk-7u71-linux-x64.tar.gzRUN update-

= $PATH: $JAVA _home/bin:$ Classpathexport PATH Note the path and version of the JDK Make configuration effective Source/etc/profileConfiguring the default JDK Create a new Java version Create a new system command link in the shell with the update-alternatives command:sudoUpdate-alternatives--Install/usr/bin/javac Javac/usr/lib/jvm/jdk1.7.0_79/bin/javac1171sudoUpda

The update-alternative in Ubuntu/debian is used to manage different versions of the same software in a system.For example, the system may contain the GNU Java compiler, and the Sun's Java compiler. You can use Update-alternatives to set which of these are currently used.Its principle is to create a link in the/usr/bin, point to a file in the/etc/alternatives, and some file is a link, pointing to the current

settings can be. Ls-l--full-time/usr/java/jdk1.7.0_71 can see that the full installation time, the indication is really just installed. [Root@localhost sss]#/usr/java/jdk1.7.0_71/bin/java-version Java Version "1.7.0_71" Java (TM) SE Runtime Environment (build 1.7.0_71-b14) Java HotSpot (TM) 64-bit Server VM (build 24.71-b01, Mixedmode) As you can see, this Java is no longer an open JDK. Ok. Vi/etc/profile Add at the end of the file Export java_home=/usr/java/jdk1.7.0_71 Exportclasspath=.: $JA

at the end of the open file? 12345 # export Java env export java_home= /usr/local/java/jdk1 .7.0 export jre_home= /usr/local/java/jdk1 .7.0 /jre export classpath=.:%java_home% /lib/dt .jar:%java_home% /lib/tools .jar export path= $JAVA _home /bin : $JRE _home /bin : $PATH Save the exit and enter the following command to make it effective? 1 source~/.bash_profile 4. Configure the default JDK (this step can be omitted

Finally, you can upgrade your system by implementing C ++ 11 GCC4.8.1. The following steps can be performed to install GCC4.8.1, sudoadd-apt-repositoryppa: ubuntu-toolchain-r/testsudoupdate-alternatives -- remove-allgccsudoupdate-alternatives -- remove Finally, the complete implementation of C ++ 11 GCC 4.8.1. Upgrade your system. The following steps can be performed to install GCC 4.8.1 in Ubuntu 13.04, Su

downloaded cannot be installed. Original Go to the directory where you downloadedthe JRE package, and change the permissions so the file is executable. Forexample: $ CD/tmp $ Chmod A + x jre-6u25-linux-x64-rpm.bin Translation Go to the JRE directory you downloaded and change the directory permissions so that they can be authorized to other users. $ CD/tmp $ Chmod A + x jre-6u25-linux-x64-rpm.bin Original Extract and run the RPM file. For example: $ Sudo./jre-6u25-linux-x64-rpm.bin The RPM IN

openjdk. To set the JDK we installed as the default JDK version, perform the following work.Run the Code:[Plain] View plaincopy Sudo Update-alternatives -- install/usr/bin/Java/usr/lib/JVM/Java-7-sun/bin/Java 300 Sudo Update-alternatives -- install/usr/bin/javac/usr/lib/JVM/Java-7-sun/bin/javac 300 Sudo Update-alternatives -- install/usr/bin/Jar/usr/lib/JVM/

I encountered this error. I saw the solution in a Foreign Forum and successfully solved the problem. I hope to help others. Error:Build/CORE/product_config.mk: 229: Warning: adding test OTA keyHost Java: clearsilver (Out/host/common/obj/java_libraries/Clearsilver_intermediates/classes)Unrecognized option: 9999999Make: *** [out/host/common/obj/java_libraries/Clearsilver_intermediates/javalib. jar] Error 41 Cause:According to the error message, it is probably a Java Virtual Machine problem. Some p

Build the ubuntu eclipse C ++ EnvironmentInstall the java Development Environment package JDK Step 1: Download jdk-7-linux-i586.tar.gz wget -c http://download.oracle.com/otn-pub/java/jdk/7/jdk-7-linux-i586.tar.gz (Note: If the download fails, we recommend that you use thunder to download it and copy it to the Linux system .)Step 2: unzip and install sudo tar zxvf ./jdk-7-linux-i586.tar.gz -C /usr/lib/jvm cd /usr/lib/jvm sudo mv jdk1.7.0/ java-7-sun Step 3: Modify Environment Variables vim

this case, you must use the "Update-alternatives" tool provided by Debian to complete the process. Program Multiple versions are available: Sudo Update-alternatives -- display Java The system only lists gij JVM, because JDK 6 is manually decompressed and installed. Enter the following two lines: Sudo Update-alternatives -- install/usr/bin/Java/usr/local/lib/jdk