Java 11 将 jdk.compiler/com.sun.tools.javac 类包含到项目中

Question

I need to work with com.sun.tools.javac classes that are private and are not visible neither during compile nor run time.

I use:

• JDK 11.0.15
• Maven build tool
• Intellij IDEA

My current state is that my imports are red-highlghited and compilation fails.

My class I want to use sun tools inside (sorry for the pic instead of code, my class is 2000+ lines length, for now I only care about availability of tools in my class):

pom.xml :

...

<properties>
    <maven.compiler.source>11</maven.compiler.source>
    <maven.compiler.target>11</maven.compiler.target>
</properties>

<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.0</version>
            <configuration>
                <source>11</source>
                <target>11</target>
            </configuration>
        </plugin>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-javadoc-plugin</artifactId>
            <version>2.9.1</version>
            <executions>
                <execution>
                    <id>attach-javadocs</id>
                    <goals>
                        <goal>jar</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>

        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-source-plugin</artifactId>
            <version>2.2.1</version>
            <executions>
                <execution>
                    <id>attach-sources</id>
                    <goals>
                        <goal>jar</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>

I need to be able to have these classes available as I "type", during mvn compile and in runtime.

com.sun packages I'd like to have:

• com.sun.tools.javac.code
• com.sun.tools.javac.comp
• com.sun.tools.javac.file
• com.sun.tools.javac.main
• com.sun.tools.javac.model
• com.sun.tools.javac.parser
• com.sun.tools.javac.processing
• com.sun.tools.javac.tree
• com.sun.tools.javac.util

Thank you in advance!

Answer 1

I was able to make it work with the following compiler plugin configuration.

<compilerArgs>
                    <arg>--add-opens=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED</arg>
                    <arg>--add-opens=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED</arg>
                    <arg>--add-opens=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED</arg>
                    <arg>--add-opens=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED</arg>
                    <arg>--add-opens=jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED</arg>
                    <arg>--add-opens=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED</arg>
                    <arg>--add-opens=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED</arg>
                    <arg>--add-opens=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED</arg>
                    <arg>--add-opens=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED</arg>

                    <arg>--add-exports=jdk.compiler/com.sun.tools.javac.code=ALL-UNNAMED</arg>
                    <arg>--add-exports=jdk.compiler/com.sun.tools.javac.comp=ALL-UNNAMED</arg>
                    <arg>--add-exports=jdk.compiler/com.sun.tools.javac.file=ALL-UNNAMED</arg>
                    <arg>--add-exports=jdk.compiler/com.sun.tools.javac.main=ALL-UNNAMED</arg>
                    <arg>--add-exports=jdk.compiler/com.sun.tools.javac.model=ALL-UNNAMED</arg>
                    <arg>--add-exports=jdk.compiler/com.sun.tools.javac.parser=ALL-UNNAMED</arg>
                    <arg>--add-exports=jdk.compiler/com.sun.tools.javac.processing=ALL-UNNAMED</arg>
                    <arg>--add-exports=jdk.compiler/com.sun.tools.javac.tree=ALL-UNNAMED</arg>
                    <arg>--add-exports=jdk.compiler/com.sun.tools.javac.util=ALL-UNNAMED</arg>
                </compilerArgs>

And other thing that broke my code was maven-javadoc-plugin added to my plugins.

Answer 2

The Javadoc for package com.sun.tools.javac in Java 11 says:

This package provides a legacy entry point for the javac tool. See the jdk.compiler module for details on replacement APIs.

👉 Access the module java.compiler , package javax.tools , for the interface JavaCompiler and class ToolProvider .

See the Javadoc for example code.

The com.sun package was never standard, never supported, and never intended for external use.

See JEP 403: Strongly Encapsulate JDK Internals .