无法公开com.sun.management.internal.OperatingSystemImpl.getOpenFileDescriptorCount()的长整型数值。

Question

我在Java 11的服务器日志中遇到了以下错误。是否有解决方法？

[2019-05-02 18:06:18 IST] [] ERROR com.codahale.metrics.ScheduledReporter [SID= UID= BGCD=] - Exception thrown from Slf4jReporter#report. Exception was suppressed.
java.lang.reflect.InaccessibleObjectException: Unable to make public long com.sun.management.internal.OperatingSystemImpl.getOpenFileDescriptorCount() accessible: module jdk.management does not "opens com.sun.management.internal" to unnamed module @489448ac
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:340)
    at java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:280)
    at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:198)
    at java.base/java.lang.reflect.Method.setAccessible(Method.java:192)
    at deployment.myPage.war//com.codahale.metrics.jvm.FileDescriptorRatioGauge.invoke(FileDescriptorRatioGauge.java:48)
    at deployment.myPage.war//com.codahale.metrics.jvm.FileDescriptorRatioGauge.getRatio(FileDescriptorRatioGauge.java:35)
    at deployment.myPage.war//com.codahale.metrics.RatioGauge.getValue(RatioGauge.java:64)
    at deployment.myPage.war//com.codahale.metrics.RatioGauge.getValue(RatioGauge.java:11)
    at deployment.myPage.war//com.codahale.metrics.DerivativeGauge.getValue(DerivativeGauge.java:23)
    at deployment.myPage.war//com.codahale.metrics.Slf4jReporter.logGauge(Slf4jReporter.java:306)
    at deployment.myPage.war//com.codahale.metrics.Slf4jReporter.report(Slf4jReporter.java:220)
    at deployment.myPage.war//com.codahale.metrics.ScheduledReporter.report(ScheduledReporter.java:243)
    at deployment.myPage.war//com.codahale.metrics.ScheduledReporter$1.run(ScheduledReporter.java:182)
    at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:515)
    at java.base/java.util.concurrent.FutureTask.runAndReset(FutureTask.java:305)
    at java.base/java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:305)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)

- SKR

Answer 1

你的项目依赖项之一尝试访问已移至内部Java模块且不再公开的JVM API。

使用以下标志运行应用程序应该解决问题：

--add-opens jdk.management/com.sun.management.internal=ALL-UNNAMED

- senjin.hajrulahovic

---

这个完美地运作了。谢谢。 - SRH LABS

Answer 2

这个问题在Dropwizard metrics 4.0.0中得到了解决，请查看https://github.com/dropwizard/metrics/pull/1236。 因此，您需要升级您的依赖版本。如果您使用Spring Boot，则可以将父版本提高到2.1。 如果升级版本不可行，请按照@senjin.hajrulahovic的回答打开com.sun.management.internal模块。

- helospark