JDK8升级11常见问题

1. 使用rt.jar/jce.jar情况

原代码：

<plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
            <source>1.8</source>
            <target>1.8</target>
            <compilerArguments>
                <bootclasspath>${java.home}/lib/rt.jar:${java.home}/lib/jce.jar</bootclasspath>
            </compilerArguments>
        </configuration>
    </plugin>

修改后：

2. Lombok版本过低

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by lombok.javac.apt.LombokProcessor to field com.sun.tools.javac.processing.JavacProcessingEnvironment.discoveredProcs
WARNING: Please consider reporting this to the maintainers of lombok.javac.apt.LombokProcessor
...........
Fatal error compiling: java.lang.ExceptionInInitializerError: com.sun.tools.javac.code.TypeTags 

修改pom.xml , lombok: 1.16.x - 1.18.x

<dependency>
     <groupId>org.projectlombok</groupId>
     <artifactId>lombok</artifactId>
     <version>1.18.24</version>
 </dependency>

3. 程序包 jdk.internal.org.objectweb.asm 不可见

3.1 JDK8中解决方案：在maven-compiler-plugin中添加rt.jar

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
        <source>1.8</source>
        <target>1.8</target>
        <compilerArguments>
            <bootclasspath>${java.home}/lib/rt.jar:${java.home}/lib/jce.jar</bootclasspath>
        </compilerArguments>
    </configuration>
</plugin>

3.2 JDK11正确的处理办法

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.8.0</version>
    <configuration>
        <source>11</source>
        <target>11</target>
        <compilerArgs>
            <arg>--add-exports</arg>
            <arg>java.base/jdk.internal.org.objectweb.asm=ALL-UNNAMED</arg>
        </compilerArgs>
    </configuration>
</plugin>

3.3 Idea开发ide的处理方式如下：

Java Compiler添加：

--add-exports java.base/jdk.internal.org.objectweb.asm=ALL-UNNAMED