在JDK 9上使用Ignite

Question

我在使用JDK 9上遇到了使用Ignite的问题。这是我的最小测试用例：

package no.ovstetun.ignite;

import org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi;
import org.junit.Test;

public class FailingIgniteTest {
    @Test
    public void failingIgnite() {
        TcpDiscoverySpi discoverySpi = new TcpDiscoverySpi();
    }
}

这段代码示例出现以下堆栈跟踪：

java.lang.ExceptionInInitializerError
  at org.apache.ignite.internal.util.IgniteUtils.<clinit>(IgniteUtils.java:769)
  at org.apache.ignite.spi.IgniteSpiAdapter.<init>(IgniteSpiAdapter.java:119)
  at org.apache.ignite.spi.discovery.tcp.TcpDiscoverySpi.<init>(TcpDiscoverySpi.java:231)
  at no.nrk.mdb.common.infrastructure.ignite.IgniteConfigurationTest.failingIgnite(IgniteConfigurationTest.java:10)
  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 org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
  at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
  at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
  at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
  at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
  at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
  at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
  at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
  at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
  at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
  at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
  at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
  at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
  at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
  at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
  at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
  at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)
Caused by: java.lang.RuntimeException: jdk.internal.misc.JavaNioAccess class is unavailable.
  at org.apache.ignite.internal.util.GridUnsafe.javaNioAccessObject(GridUnsafe.java:1453)
  at org.apache.ignite.internal.util.GridUnsafe.<clinit>(GridUnsafe.java:112)
  ... 26 more
Caused by: java.lang.IllegalAccessException: class org.apache.ignite.internal.util.GridUnsafe cannot access class jdk.internal.misc.SharedSecrets (in module java.base) because module java.base does not export jdk.internal.misc to unnamed module @31ef45e3
  at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:361)
  at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:589)
  at java.base/java.lang.reflect.Method.invoke(Method.java:556)
  at org.apache.ignite.internal.util.GridUnsafe.javaNioAccessObject(GridUnsafe.java:1450)
  ... 27 more

我正在尝试将代码库从Java 8迁移到更高版本，而Ignite现在是唯一阻碍我迁移的依赖项。我已经尝试向我的运行器中添加--add-module，但似乎无法找到使Ignite与JDK 9兼容所需的内容。Ignite版本2.4.0和2.5.0出现了相同的错误。非常感谢任何帮助！

- Trond Marius Øvstetun

Answer 1

启动Java时，请尝试添加以下参数：

--add-exports=java.base/jdk.internal.misc=ALL-UNNAMED
--add-exports=java.base/sun.nio.ch=ALL-UNNAMED 

- alamar

---

谢谢，这个可行。有没有不使用启动Java时的VM参数来实现相同效果的方法？ - Trond Marius Øvstetun

Ignite不应该在jdk.internal.misc中突破JDK内部，这太脆弱了。有人应该确保在Ignite的问题跟踪器中存在此错误。 - Alan Bateman

离堆库使用sun.misc.Unsafe，它们不应该侵入jdk.internal.misc。 - Alan Bateman

Ignite的维护人员需要修复这个问题，如果不知道他们在做什么，就无法在这里提出建议。 - Alan Bateman

@alamar 直接调用 DirectByteBuffer 构造函数有什么问题吗？为什么需要通过 JavaNioAccess 调用它？ - ZhekaKozlov