在 javac 中使用内部 sun 类
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Using internal sun classes with javac
提问by Marcin Wisnicki
Is there a way to disable restrictions of javac 1.6.0_22 that prevent me from using JRE internal classes like sun.awt.event.*?
有没有办法禁用阻止我使用 JRE 内部类的 javac 1.6.0_22 的限制sun.awt.event.*？
I'm notlooking for:
我不是在寻找：
- an explanation why it is forbidden.
- suggestion to use different classes
- suggestion to use reflection
- suggestion to use ecj/eclipse
- 解释为什么它被禁止。
- 建议使用不同的类
- 建议使用反射
- 建议使用 ecj/eclipse
I just want to know if it is possible or not, and if it is then how.
我只想知道这是否可能，如果可能，那么如何。
采纳答案by Marcin Wisnicki
I have found the answer myself.
我自己找到了答案。
When javac is compiling code it doesn't link against rt.jarby default.
Instead it uses special symbol file lib/ct.symwith class stubs.
当 javac 编译代码时，它rt.jar默认不链接。相反，它使用lib/ct.sym带有类存根的特殊符号文件。
Surprisingly this file contains many but not all of internal sun classes.
In my case one of those more-internal-than-usual classes was sun.awt.event.IgnorePaintEvent.
令人惊讶的是，该文件包含许多但不是全部的内部 sun 类。在我的情况下，那些比平常更内部的类之一是sun.awt.event.IgnorePaintEvent.
And the answer to my question is: javac -XDignore.symbol.file
我的问题的答案是： javac -XDignore.symbol.file
That's what javac uses for compiling rt.jar.
这就是 javac 用于编译rt.jar.
回答by Stephen C
Normally, this only produces a Warning message; e.g.
通常，这只会产生警告消息；例如
[javac] /media/disk/opensso2/opensso/products/federation/openfm/source/com/sun/identity/wss/xmlsig/WSSSignatureProvider.java:46: warning: com.sun.org.apache.xpath.internal.XPathAPI is Sun proprietary API and may be removed in a future release
[javac] import com.sun.org.apache.xpath.internal.XPathAPI;
Perhaps you have told the Java compiler to treat warnings as errors.
也许您已经告诉 Java 编译器将警告视为错误。
回答by karmakaze
In addition to the answer by @marcin-wisnicki if you're using Maven, note that the compiler plugin will silently drop any -XD flags, unless you also specify
<fork>true</fork>: e.g.
如果您使用 Maven，除了@marcin-wisnicki 的回答之外，请注意编译器插件将默默地删除任何 -XD 标志，除非您还指定
<fork>true</fork>：例如
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<compilerArgs>
<arg>-XDignore.symbol.file</arg>
</compilerArgs>
<fork>true</fork>
</configuration>
...
回答by juancn
There's a better solution. First add the option to javac -XDenableSunApiLintControland then use @SupressWarnings("sunapi")in your code.
有一个更好的解决方案。首先将选项添加到 javac -XDenableSunApiLintControl，然后@SupressWarnings("sunapi")在您的代码中使用。
