Java9 JNLP --add-opens 不起作用 [英] Java9 JNLP --add-opens not working
问题描述
我创建了一个简单的测试用例来测试带有新模块的 Java 9 Web Start.不幸的是，Java 9 Web Start 不像常规 Java 9 那样默认支持 --permit-illegal-access.
I have created a simple test case to test Java 9 Web Start with the new modules. Unfortunately, Java 9 Web Start does not by default support --permit-illegal-access like regular Java 9 does.
Java 9 Web Start 假设支持 --add-opens(参见 https://bugs.openjdk.java.net/browse/JDK-8172986).
Java 9 Web Start is suppose to support --add-opens (see https://bugs.openjdk.java.net/browse/JDK-8172986).
我使用的是 Java 1.9.0_181_ea.
I'm using Java 1.9.0_181_ea.
这是我的测试课:
import java.awt.Toolkit;
import java.lang.reflect.Method;
import java.lang.IllegalAccessException;
import java.lang.reflect.InvocationTargetException;
public class Java9BreaksWhenTest {
public static void main(String args[]) throws IllegalAccessException, InvocationTargetException {
System.out.println("Hello World");
// Do some dangerous reflection
Toolkit toolkit = Toolkit.getDefaultToolkit();
Class c = toolkit.getClass();
while(true) {
Method m = null;
try {
m = c.getDeclaredMethod("setDesktopProperty", String.class, Object.class);
} catch (NoSuchMethodException ex) {
c = c.getSuperclass();
if (c!=null)
continue;
} catch (SecurityException ex) {
ex.printStackTrace();
}
if (m!=null) {
m.setAccessible(true);
m.invoke(toolkit, "awt.font.desktophints", null);
System.out.println("desktop Properties changed.");
}
break;
}
}
}
这是我的 JNLP 文件，它应该使 java.awt 代码能够访问.
Here is my JNLP file which should make java.awt code able to accessible.
<?xml version="1.0" encoding="UTF-8"?>
<jnlp spec="1.0+" codebase="file:///home/smm/hcs/testcode" href="java9BreaksWhenTest.jnlp">
<information>
<title>Java 9 Breaks When Test</title>
<vendor>HCS</vendor>
<homepage href="http://hcs.us.com"/>
<description>Java 9 Breaks When Test</description>
<description kind="short">Java 9 Breaks When Test</description>
</information>
<security><all-permissions/></security>
<update check="timeout" policy="always"/>
<resources>
<j2se version="9" java-vm-args="--add-opens java.desktop/java.awt=ALL-UNNAMED" />
<jar href="Java9BreaksWhenTest.jar" main="true" download="eager"/>
</resources>
<application-desc main-class="Java9BreaksWhenTest">
</application-desc>
</jnlp>
这似乎与此处讨论的内容一致(如何将 Java 9 '--permit-illegal-access' 标志传递给 Webstart 应用程序?).但是，它不起作用.在 Java Web Start 下运行它我收到以下错误:
This seems inline with what is discussed here (How to pass the Java 9 '--permit-illegal-access' flag to a Webstart application?). However, it does not work. Running it under Java Web Start I get the following error:
Hello World
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at jdk.javaws@9/com.sun.javaws.Launcher.executeApplication(Launcher.java:1741)
at jdk.javaws@9/com.sun.javaws.Launcher.executeMainClass(Launcher.java:1677)
at jdk.javaws@9/com.sun.javaws.Launcher.doLaunchApp(Launcher.java:1525)
at jdk.javaws@9/com.sun.javaws.Launcher.run(Launcher.java:158)
at java.base/java.lang.Thread.run(Thread.java:844)
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final void java.awt.Toolkit.setDesktopProperty(java.lang.String,java.lang.Object) accessible: module java.desktop does not "opens java.awt" to unnamed module @1f749ac
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:337)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:281)
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:198)
at java.base/java.lang.reflect.Method.setAccessible(Method.java:192)
at Java9BreaksWhenTest.main(Java9BreaksWhenTest.java:26)
... 9 more
#### Java Web Start Error:
#### Unable to make protected final void java.awt.Toolkit.setDesktopProperty(java.lang.String,java.lang.Object) accessible: module java.desktop does not "opens java.awt" to unnamed module @1f749ac
java.lang.reflect.InaccessibleObjectException: Unable to make protected final void java.awt.Toolkit.setDesktopProperty(java.lang.String,java.lang.Object) accessible: module java.desktop does not "opens java.awt" to unnamed module @1f749ac
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:337)
at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:281)
at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:198)
at java.base/java.lang.reflect.Method.setAccessible(Method.java:192)
at Java9BreaksWhenTest.main(Java9BreaksWhenTest.java:26)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at jdk.javaws@9/com.sun.javaws.Launcher.executeApplication(Launcher.java:1741)
at jdk.javaws@9/com.sun.javaws.Launcher.executeMainClass(Launcher.java:1677)
at jdk.javaws@9/com.sun.javaws.Launcher.doLaunchApp(Launcher.java:1525)
at jdk.javaws@9/com.sun.javaws.Launcher.run(Launcher.java:158)
at java.base/java.lang.Thread.run(Thread.java:844)
我不清楚我的错误在哪里以及为什么无法通过反射使用 java.awt.Toolkit.
It is unclear to me where my error is and why java.awt.Toolkit is not available to use via Reflection.
推荐答案
因为 Java 9 还不够混乱，正确的答案是:
Because Java 9 isn't confusing enough, the right answer is:
<j2se version="9" java-vm-args="--add-opens=java.desktop/java.awt=ALL-UNNAMED" />
等号在 JNLP 文件中很重要，但在命令行中不重要！
That equals sign matters in a JNLP file, but does not on the command line!
在命令行上:
java --illegal-access=deny --add-opens java.desktop/java.awt=ALL-UNNAMED -cp . Java9BreaksWhenTest
和
java --illegal-access=deny --add-opens=java.desktop/java.awt=ALL-UNNAMED -cp . Java9BreaksWhenTest
正常工作！
这篇关于Java9 JNLP --add-opens 不起作用的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
