Maven 3.8.0 编译器 - 编译时出现致命错误：不支持发布版本 11

Question

我无法使用带有最新版本的 maven-编译器-插件的 Java 11 进行构建。

绒球.xml：

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.0</version>
            <configuration>
                <release>11</release>
            </configuration>
        </plugin>
    <plugins>
<build>

当我尝试使用 Maven 构建时：

➜  mvn clean compile
[INFO] Scanning for projects...
[INFO] 
[INFO] ------------------------------------------------------------------------
[INFO] Building service 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-compiler-plugin:3.8.0:compile (default-compile) @ service ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 80 source files to /home/mip/service/target/classes
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.859 s
[INFO] Finished at: 2018-08-01T11:20:55+01:00
[INFO] Final Memory: 32M/124M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project service: Fatal error compiling: release version 11 not supported -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

以下是我正在使用的Maven和Java版本：

➜  mvn -version
Apache Maven 3.5.2
Maven home: /usr/share/maven
Java version: 10.0.1, vendor: Oracle Corporation
Java home: /usr/lib/jvm/java-11-openjdk-amd64
Default locale: en_GB, platform encoding: UTF-8
OS name: "linux", version: "4.15.0-29-generic", arch: "amd64", family:     "unix"
➜  /usr/lib/jvm/java-11-openjdk-amd64/bin/java -version
openjdk version "10.0.1" 2018-04-17
OpenJDK Runtime Environment (build 10.0.1+10-Ubuntu-3ubuntu1)
OpenJDK 64-Bit Server VM (build 10.0.1+10-Ubuntu-3ubuntu1, mixed mode)

Java 11 将自己标识为“10.0.1”会导致问题吗？如果我修改我的pom.xml

➜  ~ /usr/lib/jvm/java-11-openjdk-amd64/bin/javac -version
javac 10.0.1 

➜ javac --release 11 SomeClass.java
javac: release version 11 not 
supported Usage: javac <options> <source files>
use --help for a list of possible options

我认为这是 Ubuntu openjdk-11-jdk 软件包的问题：

➜  ~ sudo apt install openjdk-11-jdk
Reading package lists... Done
Building dependency tree       
Reading state information... Done
openjdk-11-jdk is already the newest version (10.0.1+10-3ubuntu1).
0 to upgrade, 0 to newly install, 0 to remove and 2 not to upgrade.




Answer 1

对我来说，这是由于安装了Java 11 JRE，而不是JDK。文件夹名称中包含“jdk”，因此我认为它是正确的，但是在 /bin 文件夹中查找我没有看到 javac 可执行文件，因此我认为它正在回退到系统上的默认 Java 早于 Java 11。

Answer 2

我在 docker 容器中构建 java 项目时遇到了此错误。它一定与 maven 的安装方式有关，因为当我将我的容器基于官方 maven 映像时，它就消失了。

特别是，这意味着在我的 Dockerfile 中使用以下内容：

FROM maven:3.6.3-jdk-11-slim

经过进一步调查，关键的区别在于我有软件包java-11-openjdk，但我需要java-11-openjdk-devel。

Answer 3

需要设置JAVA_HOME MVN。我遇到了同样的问题，设置JAVA_HOME来纠正JDK就可以了。