jsf - 使用 JDK 17 通过 JSF/EL 访问 ZoneInfo 时出现 IllegalAccessException

Question

在将大型 JEE8 应用程序移植到 Java 17 时，我在呈现简单的 EL 表达式时偶然发现了 IllegalAccessException:#{myWarBean.defaultTZ.rawOffset}。我设法在 SSCCE on github 中重现了这个问题.当您在 Wildfly 应用程序服务器(我使用的是 26.1.1.Final)上运行该应用程序时，您会得到以下堆栈跟踪信息:

SEVERE [javax.enterprise.resource.webcontainer.jsf.application] (default task-1) Error Rendering View[/index.xhtml]: javax.el.ELException: /index.xhtml @23,74 value="raw offset=#{myWarBean.defaultTZ.rawOffset}": java.lang.IllegalAccessException: class javax.el.BeanELResolver cannot access class sun.util.calendar.ZoneInfo (in module java.base) because module java.base does not export sun.util.calendar to unnamed module @6a1cb0de
    at com.sun.jsf-impl@2.3.17.SP01//com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:77)
    at javax.faces.api@3.1.0.SP01//javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
    at javax.faces.api@3.1.0.SP01//javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:181)
    at javax.faces.api@3.1.0.SP01//javax.faces.component.UIOutput.getValue(UIOutput.java:140)
    at com.sun.jsf-impl@2.3.17.SP01//com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:198)
    at com.sun.jsf-impl@2.3.17.SP01//com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:328)
    at com.sun.jsf-impl@2.3.17.SP01//com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:143)
    at javax.faces.api@3.1.0.SP01//javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:600)
    at com.sun.jsf-impl@2.3.17.SP01//com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:286)
    at com.sun.jsf-impl@2.3.17.SP01//com.sun.faces.renderkit.html_basic.GroupRenderer.encodeChildren(GroupRenderer.java:90)
    at javax.faces.api@3.1.0.SP01//javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:571)
    at javax.faces.api@3.1.0.SP01//javax.faces.component.UIComponent.encodeAll(UIComponent.java:1648)
    at javax.faces.api@3.1.0.SP01//javax.faces.component.UIComponent.encodeAll(UIComponent.java:1651)
    at javax.faces.api@3.1.0.SP01//javax.faces.component.UIComponent.encodeAll(UIComponent.java:1651)
    at com.sun.jsf-impl@2.3.17.SP01//com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:461)
    [...]
Caused by: javax.el.ELException: java.lang.IllegalAccessException: class javax.el.BeanELResolver cannot access class sun.util.calendar.ZoneInfo (in module java.base) because module java.base does not export sun.util.calendar to unnamed module @6a1cb0de
    at javax.el.api@2.0.0.Final//javax.el.BeanELResolver.getValue(BeanELResolver.java:193)
    at com.sun.jsf-impl@2.3.17.SP01//com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:156)
    at com.sun.jsf-impl@2.3.17.SP01//com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:184)
    at org.glassfish.jakarta.el@3.0.3.jbossorg-4//com.sun.el.parser.AstValue.getValue(AstValue.java:114)
    at org.glassfish.jakarta.el@3.0.3.jbossorg-4//com.sun.el.parser.AstValue.getValue(AstValue.java:177)
    at org.glassfish.jakarta.el@3.0.3.jbossorg-4//com.sun.el.parser.AstDeferredExpression.getValue(AstDeferredExpression.java:39)
    at org.glassfish.jakarta.el@3.0.3.jbossorg-4//com.sun.el.parser.AstCompositeExpression.getValue(AstCompositeExpression.java:44)
    at org.glassfish.jakarta.el@3.0.3.jbossorg-4//com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:183)
    at org.jboss.weld.core@3.1.9.Final//org.jboss.weld.module.web.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
    at org.jboss.weld.core@3.1.9.Final//org.jboss.weld.module.web.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
    at com.sun.jsf-impl@2.3.17.SP01//com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:73)
    ... 73 more
Caused by: java.lang.IllegalAccessException: class javax.el.BeanELResolver cannot access class sun.util.calendar.ZoneInfo (in module java.base) because module java.base does not export sun.util.calendar to unnamed module @6a1cb0de
    at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:392)
    at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:674)
    at java.base/java.lang.reflect.Method.invoke(Method.java:560)
    at javax.el.api@2.0.0.Final//javax.el.BeanELResolver.getValue(BeanELResolver.java:186)
    ... 83 more

看来，问题出在访问 java.util.TimeZone 的 EL 表达式。 TimeZone 类在内部使用 sun.util.calendar.ZoneInfo。而且这似乎不再合法。

这只发生在 Java 17 中。在 Java 11 中运行时，一切正常。

我可以通过在启动 wildfly 时添加以下参数来解决异常:

--add-exports=java.base/sun.util.calendar=ALL-UNNAMED

但是，我认为应该可以在没有此解决方法的情况下运行该示例。

知道我遗漏了什么吗？这甚至可能是 Java/JDK 17 中的错误吗？

Answer 1

它可以使用普通的 Java 应用程序类重现，如下所示:

package com.stackoverflow.q72361100;

import java.lang.reflect.Method;
import java.util.TimeZone;

public class Test {
    public static void main(String... args) throws Exception {
        TimeZone instance = TimeZone.getDefault();
        Class<?> cls = instance.getClass();
        Method method = cls.getMethod("getRawOffset");
        Object result = method.invoke(instance); // java.lang.IllegalAccessException
        System.out.println(result);
    }
}

这里的问题是 instance.getClass() 返回 sun.util.calendar.ZoneInfo 因为这是 TimeZone#getDefault()< 返回的实现。解决方法是使用 TimeZone.class 而不是 instance.getClass():

package com.stackoverflow.q72361100;

import java.lang.reflect.Method;
import java.util.TimeZone;

public class Test {
    public static void main(String... args) throws Exception {
        TimeZone instance = TimeZone.getDefault();
        Class<?> cls = TimeZone.class; // Work around
        Method method = cls.getMethod("getRawOffset");
        Object result = method.invoke(instance);
        System.out.println(result);
    }
}

我认为这需要更改 EL 规范。理想情况下，如果根据 Method#canAccess() 可以访问该方法，它应该在声明的父类(super class)中进一步搜索然后改用它。

package com.stackoverflow.q72361100;

import java.lang.reflect.Method;
import java.util.TimeZone;

public class Test {
    public static void main(String... args) throws Exception {
        TimeZone instance = TimeZone.getDefault();
        Class<?> cls = instance.getClass();
        Method method = getAccessibleMethod(instance, cls, "getRawOffset"); // Look in superclasses as well.
        Object result = method.invoke(instance);
        System.out.println(result);
    }

    private static Method getAccessibleMethod(Object instance, Class<?> cls, String methodName) throws NoSuchMethodException {
        Method method = cls.getMethod(methodName);

        if (method.canAccess(instance)) {
            return method;
        }

        return getAccessibleMethod(instance, cls.getSuperclass(), methodName);
    }

}

我在 EL 规范中创建了一个问题:https://github.com/jakartaee/expression-language/issues/188

在他们修复它之前，您可以通过为其添加专用的 getter 来解决它:

public int getDefaultTZrawOffset() {
    return getDefaultTZ().getRawOffset();
}

#{myWarBean.defaultTZrawOffset}