在 Ubuntu 上解决 java 和 javac 之间的版本冲突
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Resolving version conflict between java and javac on Ubuntu
提问by xralf
I have a problem with my compiled Java application on Ubuntu. It throws UnsupportedClassVersionError.
I am compiling with a higher JDK version than the one that is configured in my PATH to run Java:
我在 Ubuntu 上编译的 Java 应用程序有问题。它抛出UnsupportedClassVersionError. 我正在使用比我的 PATH 中配置的更高版本的 JDK 版本进行编译以运行 Java：
$ javac -version
javac 1.7.0_147
$ java -version
java version "1.6.0_23"
OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b23~pre11-0ubuntu1.11.10.2)
OpenJDK Client VM (build 20.0-b11, mixed mode, sharing)
How can I resolve this?
我该如何解决这个问题？
采纳答案by thejartender
Run either of the following to locate where the location is of that
运行以下任一命令以定位该位置的位置
javac 1.7.0_147
being used as follows:
用法如下：
whereis javac
or
或者
locate javac
or
或者
find javac
Then once you found the directory, symbolically and forcefully link the bin contents to /usr/bin:
然后，一旦找到目录，就象征性地将 bin 内容强制链接到 /usr/bin：
sudo ln -f -s [put location here]/bin/* /usr/bin
回答by Ruju
Type following command in terminal :
在终端中输入以下命令：
sudo update-alternatives --config java
It will ask you for:
它会问你：
There are 2 choices for the alternative java (providing /usr/bin/java).
替代 java 有 2 个选择（提供 /usr/bin/java）。
Selection Path Priority Status
0 /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 auto mode
1 /usr/lib/jvm/java-6-openjdk-amd64/jre/bin/java 1061 manual mode
2 /usr/lib/jvm/java-7-openjdk-amd64/jre/bin/java 1051 manual mode
Press enter to keep the current choice[*], or type selection number:
I enter 2 as I want to use java 1.7.0_21
我输入 2 因为我想使用 java 1.7.0_21
回答by Tony
You will also need to do:
您还需要执行以下操作：
sudo update-alternatives --config javac
Select the desired java compiler from the list provided. For example on Centos 5
从提供的列表中选择所需的 Java 编译器。例如在 Centos 5
There are 2 programs which provide 'javac'.
Selection Command
-----------------------------------------------
1 /usr/lib/jvm/java-1.6.0-openjdk/bin/javac
*+ 2 /usr/lib/jvm/java-1.7.0-openjdk/bin/javac
回答by apesa
This is what you want Java and Ubuntu. I have the same config basically, but I am switching back and forth from Glassfish and Java7. Take a look and try setting up your Java env in a similar fashion
这就是你想要的Java 和 Ubuntu。我基本上有相同的配置，但我在 Glassfish 和 Java7 之间来回切换。看看并尝试以类似的方式设置您的 Java 环境
回答by Laxman G
I have added and installed alternatives for Java and Javac with below steps it work for me :
我已经添加并安装了 Java 和 Javac 的替代品，以下步骤对我有用：
Steps 1: Add the Java and Javac alternatives:
步骤 1：添加 Java 和 Javac 替代品：
Command to add Javac:
添加Javac的命令：
sudo update-alternatives --install "/usr/bin/java" "java" "/opt/amazon-jdk-11/bin/java" 1
i.e : "/opt/amazon-jdk-11/bin/javac" this the new path of java
即：“/opt/amazon-jdk-11/bin/javac”这是java的新路径
sudo update-alternatives --install "/usr/bin/javac" "javac" "/opt/amazon-jdk-11/bin/javac" 1
i.e : /opt/amazon-jdk-11/bin/javac is the new path of javac
即：/opt/amazon-jdk-11/bin/javac 是javac的新路径
Steps 2: Installed the Java and Javac alternatives:
步骤 2：安装 Java 和 Javac 替代品：
sudo update-alternatives --config javac
sudo update-alternatives --config javac
Once you enter above command you will able to see screen like below you can select your number that you want to configure java.
输入上述命令后，您将能够看到如下屏幕，您可以选择要配置 java 的号码。
I have selected " 1"int the list as I wanted to installed "/opt/amazon-jdk-11/bin/java" as my javac.
我在列表中选择了“ 1”，因为我想安装“/opt/amazon-jdk-11/bin/java”作为我的 javac。
Verify your Java alternative installation is successful or not with below commands:
使用以下命令验证您的Java 替代安装是否成功：
which javacand which javayou will able to see screen like below :
which javac而which java你将能够看到屏幕象下面这样：
