java - JPMS : --add-opens doesn't work for java. lang.reflect.InaccessibleObjectException

Question

我将 Java 14 与 Jetty 9.4 和 Weld-servlet-shaded-3.1 一起使用，但出现此异常:

Caused by: java.lang.reflect.InaccessibleObjectException: 
Unable to make protected final java.lang.Class   
java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int)
throws java.lang.ClassFormatError accessible: module java.base does 
not "opens java.lang" to module weld.servlet.shaded.

根据这里的回答: https://stackoverflow.com/a/41265267/5057736我试着添加

--add-opens java.base/java.lang=ALL-UNNAMED 

和

--add-opens java.base/java.lang=weld.servlet.shaded 

但没有人帮忙。谁能说一下怎么修？

编辑 1
我发现这个问题出现在 Java 12,13,14 OpenJDK/Oracle 中。但是，如果我使用 Java 11 OpenJDK/Oralce 一切正常，我什至不添加任何 --add-opens .怎么解释？

编辑 2
我查过 Jetty pom和 Weld pom它们都具有相同的属性:

<compiler.source>1.8</compiler.source>
<compiler.target>1.8</compiler.target>

编辑 3
java 版

$ java -version
openjdk version "14" 2020-03-17
OpenJDK Runtime Environment (build 14+36-1461)
OpenJDK 64-Bit Server VM (build 14+36-1461, mixed mode, sharing)

开始申请

$java .... --add-opens java.base/java.lang=weld.servlet.shaded ...

这是堆栈跟踪

09:58:41.243 [RMI TCP Connection(2)-127.0.0.1] INFO  org.jboss.weld.environment.servletWeldServlet - WELD-ENV-001008: Initialize Weld using ServletContainerInitializer
09:58:41.293 [RMI TCP Connection(2)-127.0.0.1] INFO  org.jboss.weld.Version - WELD-000900: 3.1.0 (Final)
09:58:41.468 [RMI TCP Connection(2)-127.0.0.1] WARN  org.jboss.weld.environment.servletWeldServlet - WELD-ENV-001004: Found both WEB-INF/beans.xml and WEB-INF/classes/META-INF/beans.xml. It is not portable to use both locations at the same time. Weld is going to use: file:/home/<SOME TEXT DELETED>/webapp/WEB-INF/beans.xml
09:58:41.479 [RMI TCP Connection(2)-127.0.0.1] INFO  org.jboss.weld.Bootstrap - WELD-ENV-000014: Falling back to Java Reflection for bean-discovery-mode="annotated" discovery. Add org.jboss:jandex to the classpath to speed-up startup.
09:58:41.550 [RMI TCP Connection(2)-127.0.0.1] WARN  org.eclipse.jetty.annotations.ServletContainerInitializersStarter - 
java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to module weld.servlet.shaded
    at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:349) ~[?:?]
    at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:289) ~[?:?]
    at java.lang.reflect.Method.checkCanSetAccessible(Method.java:196) ~[?:?]
    at java.lang.reflect.Method.setAccessible(Method.java:190) ~[?:?]
    at org.jboss.weld.util.bytecode.ClassFileUtils$1.run(ClassFileUtils.java:88) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at java.security.AccessController.doPrivileged(AccessController.java:554) ~[?:?]
    at org.jboss.weld.util.bytecode.ClassFileUtils.makeClassLoaderMethodsAccessible(ClassFileUtils.java:64) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.jboss.weld.bootstrap.WeldStartup.startContainer(WeldStartup.java:220) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.jboss.weld.bootstrap.WeldBootstrap.startContainer(WeldBootstrap.java:72) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.jboss.weld.bootstrap.WeldBootstrap.startContainer(WeldBootstrap.java:67) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.jboss.weld.environment.servlet.WeldServletLifecycle.initialize(WeldServletLifecycle.java:182) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.jboss.weld.environment.servlet.EnhancedListener.onStartup(EnhancedListener.java:62) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.eclipse.jetty.plus.annotation.ContainerInitializer.callStartup(ContainerInitializer.java:140) ~[jetty-plus-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.annotations.ServletContainerInitializersStarter.doStart(ServletContainerInitializersStarter.java:64) [jetty-annotations-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) [jetty-util-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:346) [jetty-servlet-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1497) [jetty-webapp-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1459) [jetty-webapp-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:852) [jetty-server-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:278) [jetty-servlet-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:545) [jetty-webapp-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) [jetty-util-9.4.14.v20181114.jar:?]
    <SOME TEXT DELETED>
09:58:41.555 [RMI TCP Connection(2)-127.0.0.1] WARN  org.eclipse.jetty.webapp.WebAppContext - Failed startup of context o.e.j.w.WebAppContext@6a329710{/,file:///home//<SOME TEXT DELETED>/webapp/,UNAVAILABLE}{/home/<SOME TEXT DELETED>.war}
java.lang.RuntimeException: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to module weld.servlet.shaded
    at org.eclipse.jetty.annotations.ServletContainerInitializersStarter.doStart(ServletContainerInitializersStarter.java:69) ~[jetty-annotations-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) ~[jetty-util-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:346) ~[jetty-servlet-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1497) ~[jetty-webapp-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1459) ~[jetty-webapp-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:852) ~[jetty-server-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:278) ~[jetty-servlet-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:545) [jetty-webapp-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68) [jetty-util-9.4.14.v20181114.jar:?]
    <SOME TEXT DELETED>
Caused by: java.lang.reflect.InaccessibleObjectException: Unable to make protected final java.lang.Class java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) throws java.lang.ClassFormatError accessible: module java.base does not "opens java.lang" to module weld.servlet.shaded
    at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:349) ~[?:?]
    at java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:289) ~[?:?]
    at java.lang.reflect.Method.checkCanSetAccessible(Method.java:196) ~[?:?]
    at java.lang.reflect.Method.setAccessible(Method.java:190) ~[?:?]
    at org.jboss.weld.util.bytecode.ClassFileUtils$1.run(ClassFileUtils.java:88) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at java.security.AccessController.doPrivileged(AccessController.java:554) ~[?:?]
    at org.jboss.weld.util.bytecode.ClassFileUtils.makeClassLoaderMethodsAccessible(ClassFileUtils.java:64) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.jboss.weld.bootstrap.WeldStartup.startContainer(WeldStartup.java:220) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.jboss.weld.bootstrap.WeldBootstrap.startContainer(WeldBootstrap.java:72) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.jboss.weld.bootstrap.WeldBootstrap.startContainer(WeldBootstrap.java:67) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.jboss.weld.environment.servlet.WeldServletLifecycle.initialize(WeldServletLifecycle.java:182) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.jboss.weld.environment.servlet.EnhancedListener.onStartup(EnhancedListener.java:62) ~[weld-servlet-shaded-3.1.0.Final.jar:?]
    at org.eclipse.jetty.plus.annotation.ContainerInitializer.callStartup(ContainerInitializer.java:140) ~[jetty-plus-9.4.14.v20181114.jar:?]
    at org.eclipse.jetty.annotations.ServletContainerInitializersStarter.doStart(ServletContainerInitializersStarter.java:64) ~[jetty-annotations-9.4.14.v20181114.jar:?]
    ... 31 more

编辑 4
我发现由于 Weld 会发生不同的行为。这是来自 ClassFileUtils 的片段:

public static void makeClassLoaderMethodsAccessible() {
    // the AtomicBoolean make sure this gets invoked only once as WeldStartup is triggered per deployment
    if (classLoaderMethodsMadeAccessible.compareAndSet(false, true)) {
        try {
            AccessController.doPrivileged(new PrivilegedExceptionAction<Object>() {
                public Object run() throws Exception {
                    Class<?> cl = Class.forName("java.lang.ClassLoader");
                    final String name = "defineClass";

                    defineClass1 = cl.getDeclaredMethod(name, String.class, byte[].class, int.class, int.class);
                    defineClass2 = cl.getDeclaredMethod(name, String.class, byte[].class, int.class, int.class, ProtectionDomain.class);

                    // First try with Unsafe to avoid illegal access
                    try {
                        // get Unsafe singleton instance
                        Field singleoneInstanceField = Unsafe.class.getDeclaredField("theUnsafe");
                        singleoneInstanceField.setAccessible(true);
                        Unsafe theUnsafe = (Unsafe) singleoneInstanceField.get(null);

                        // get the offset of the override field in AccessibleObject
                        long overrideOffset = theUnsafe.objectFieldOffset(AccessibleObject.class.getDeclaredField("override"));

                        // make both accessible
                        theUnsafe.putBoolean(defineClass1, overrideOffset, true);
                        theUnsafe.putBoolean(defineClass2, overrideOffset, true);
                        return null;
                    } catch (NoSuchFieldException e) {
                        // This is JDK 12+, the "override" field isn't there anymore, fallback to setAccessible()
LINE 88                 defineClass1.setAccessible(true);
                        defineClass2.setAccessible(true);
                        return null;
                    }
                }
            });
        } catch (PrivilegedActionException pae) {
            throw new RuntimeException("cannot initialize ClassPool", pae.getException());
        }
    }
}

正如您在第 88 行看到的，ti 调用了被 JPMS 阻止的 setAccessible(true) 方法。那么，考虑到 Weld 和 Jetty 在子 JPMS 层中，最后一个问题是否可以通过 JPMS 设置来解决这个问题？

Answer 1

我发现有两个问题:

Weld ClassFileUtils.makeClassLoaderMethodsAccessible() 与 JDK11 和 JDK12+ 的工作方式不同。

--add-opens as CLI 参数不适用于动态创建的层 JPMS？查看详情 here