ubuntu – 安装openjdk-7-jdk不会更新java(仍然是版本1.6)
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我在更新Java时遇到问题.我正在运行Ubuntu 11.10.
我可以执行sudo apt-get install openjdk-7-jdk并成功完成. javac -version是1.7,但是java -version是1.6.这类似于this problem,但据我所知,我的问题并非如此.
$echo $PATH
/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
谢谢.
解决方法:
更新：
找到一个有很好解释的网站：LINK
从链接：
然后我们必须做一些配置.
Debian有一个脚本来维护不同版本的程序,比如java,称为update-alternatives.
update-alternatives --install /usr/bin/java java /usr/lib/jvm/jdk1.7.0/bin/java 1065 update-alternatives --install /usr/bin/javac javac /usr/lib/jvm/jdk1.7.0/bin/javac 1065
1065是给定优先级的地方.
要检查我的安装,请使用-config参数
update-alternatives –config java
这打印：
替代java有两种选择(提供/usr/bin/java).
Selection Path Priority Status ------------------------------------------------------------ * 0 /usr/lib/jvm/jdk1.7.0/bin/java 1065 auto mode 1 /usr/lib/jvm/java-6-openjdk/jre/bin/java 1061 manual mode 2 /usr/lib/jvm/jdk1.7.0/bin/java 1065 manual mode
并且因为1065高于1061,所以在我的机器上默认使用全新安装的java 7
java -version
打印：
java version "1.7.0" Java(TM) SE Runtime Environment (build 1.7.0-b147) Java HotSpot(TM) 64-Bit Server VM (build 21.0-b17, mixed mode)
注意：这可能使其更容易理解.
SLES11 # which java /usr/bin/java SLES11 # update-alternatives --list java /usr/lib64/jvm/jre-1.6.0-ibm/bin/java SLES11 # update-alternatives --display java java - status is auto. link currently points to /usr/lib64/jvm/jre-1.6.0-ibm/bin/java /usr/lib64/jvm/jre-1.6.0-ibm/bin/java - priority 1608 slave rmiregistry: /usr/lib64/jvm/jre-1.6.0-ibm/bin/rmiregistry slave tnameserv: /usr/lib64/jvm/jre-1.6.0-ibm/bin/tnameserv slave rmid: /usr/lib64/jvm/jre-1.6.0-ibm/bin/rmid slave jre_exports: /usr/lib64/jvm-exports/jre-1.6.0-ibm slave policytool: /usr/lib64/jvm/jre-1.6.0-ibm/bin/policytool slave keytool: /usr/lib64/jvm/jre-1.6.0-ibm/bin/keytool slave jre: /usr/lib64/jvm/jre-1.6.0-ibm Current `best' version is /usr/lib64/jvm/jre-1.6.0-ibm/bin/java.
手册页提供了update-alternatives用于其目录的路径.
SLES11 # pwd /etc/alternatives SLES11 # ll lrwxrwxrwx 1 root root 37 Mar 19 06:03 java -> /usr/lib64/jvm/jre-1.6.0-ibm/bin/java lrwxrwxrwx 1 root root 28 Mar 19 06:03 jre -> /usr/lib64/jvm/jre-1.6.0-ibm lrwxrwxrwx 1 root root 28 Mar 19 06:03 jre_1.6.0 -> /usr/lib64/jvm/jre-1.6.0-ibm lrwxrwxrwx 1 root root 36 Mar 19 06:03 jre_1.6.0_exports -> /usr/lib64/jvm-exports/jre-1.6.0-ibm lrwxrwxrwx 1 root root 36 Mar 19 06:03 jre_exports -> /usr/lib64/jvm-exports/jre-1.6.0-ibm lrwxrwxrwx 1 root root 28 Mar 19 06:03 jre_ibm -> /usr/lib64/jvm/jre-1.6.0-ibm lrwxrwxrwx 1 root root 36 Mar 19 06:03 jre_ibm_exports -> /usr/lib64/jvm-exports/jre-1.6.0-ibm
如果您已安装它们并且只需要更改默认值,则进行更改.
SLES11 # update-alternatives --config java There is only 1 program which provides java (/usr/lib64/jvm/jre-1.6.0-ibm/bin/java). Nothing to configure.
原答案：
如果查看/ etc / java或/ etc / java-7-openjdk之类的内容,您应该看到配置文件.
java.conf或jvm.cfg
这通常(取决于)配置文件设置您的选项.您可以同时安装多个版本的Java,并更改启动变量以影响哪个是您的默认JVM.
来自CentOS java.conf
# If you have the a base JRE package installed # (e.g. java-1.6.0-openjdk): #JAVA_HOME=$JVM_ROOT/jre # If you have the a devel JDK package installed # (e.g. java-1.6.0-openjdk-devel): #JAVA_HOME=$JVM_ROOT/java
来自Ubuntu jvm.cfg
# List of JVMs that can be used as an option to java, javac, etc. # Order is important -- first in this list is the default JVM. # NOTE that this both this file and its format are UNSUPPORTED and # WILL GO AWAY in a future release. # # You may also select a JVM in an arbitrary location with the # "-XXaltjvm=" option, but that too is unsupported # and may not be available in a future release. # -server KNOWN -client IGNORE -hotspot ERROR -classic WARN -native ERROR -green ERROR -jamvm KNOWN -cacao KNOWN -zero KNOWN -shark ALIASED_TO -zero
在Ubuntu上有一个名为update-java-alternatives的程序
这是手册页的前几行
NAME
update-java-alternatives - update alternatives for jre/sdk installations
SYNOPSIS
update-java-alternatives [--jre] [--plugin] [-t|--test|-v|--verbose]
-l|--list []
-s|--set
-a|--auto
-h|-?|--help
DESCRIPTION
update-java-alternatives updates all alternatives belonging to one runtime or development kit for the Java language. A package does provide these
information of it's alternatives in /usr/lib/jvm/..jinfo.
root@ubuntul:/# update-java-alternatives -l java-1.6.0-openjdk 1061 /usr/lib/jvm/java-1.6.0-openjdk
-s|--set
Set all alternatives of the registered jre/sdk installation to the program path provided by the installation.
对于java启动环境,我通常也会看到/etc/profile.d中的链接.
我的猜测是你的java库安装在同一个地方,配置文件仍然默认为原始版本.您应该只需要提供新的JVM路径.
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