在新装IDEA导入Flink源码时出现一些问题，在此记录，希望能帮到大伙！
一、环境
IDEA2019.1.2（破解版）；OpenJDK 1.8.0_40；Maven 3.5.3/3.2.5/3.6.2
二、报错现象及解决方法
导入源码后，发现无法自动下载源码依赖，报错如下：
java.lang.RuntimeException: org.apache.maven.model.resolution.UnresolvableModelException: Failure to transfer org.apache:apache:pom:18 from http://maven.aliyun.com/nexus/content/groups/public/ was cached in the local repository, resolution will not be reattempted until the update interval of alimaven has elapsed or updates are forced. Original error: Could not transfer artifact org.apache:apache:pom:18 from/to alimaven (http://maven.aliyun.com/nexus/content/groups/public/): java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty at org.apache.maven.project.ProjectModelResolver.resolveModel(ProjectModelResolver.java:197) at org.apache.maven.project.ProjectModelResolver.resolveModel(ProjectModelResolver.java:243) at org.apache.maven.model.building.DefaultModelBuilder.readParentExternally(DefaultModelBuilder.java:1052) at org.apache.maven.model.building.DefaultModelBuilder.readParent(DefaultModelBuilder.java:830) at org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:332) at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:158) at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:116) at org.jetbrains.idea.maven.server.Maven3ServerEmbedder.buildSinglePom(Maven3ServerEmbedder.java:177) at org.jetbrains.idea.maven.server.Maven3ServerEmbedder.getProjectBuildingResults(Maven3ServerEmbedder.java:160) at org.jetbrains.idea.maven.server.Maven3ServerEmbedderImpl$3.run(Maven3ServerEmbedderImpl.java:663) at org.jetbrains.idea.maven.server.Maven3ServerEmbedderImpl.executeWithMavenSession(Maven3ServerEmbedderImpl.java:627) at org.jetbrains.idea.maven.server.Maven3ServerEmbedderImpl.doResolveProject(Maven3ServerEmbedderImpl.java:646) at org.jetbrains.idea.maven.server.Maven3ServerEmbedderImpl.resolveProject(Maven3ServerEmbedderImpl.java:580) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323) at sun.rmi.transport.Transport$1.run(Transport.java:200) at sun.rmi.transport.Transport$1.run(Transport.java:197) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:196) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$254(TCPTransport.java:683) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$$Lambda$1/8104157.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.RuntimeException: org.eclipse.aether.resolution.ArtifactResolutionException: Failure to transfer org.apache:apache:pom:18 from http://maven.aliyun.com/nexus/content/groups/public/ was cached in the local repository, resolution will not be reattempted until the update interval of alimaven has elapsed or updates are forced. Original error: Could not transfer artifact org.apache:apache:pom:18 from/to alimaven (http://maven.aliyun.com/nexus/content/groups/public/): java.lang.RuntimeException: Unexpected error: java.security.InvalidAlgorithmParameterException: the trustAnchors parameter must be non-empty at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:422) at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:224) at org.eclipse.aether.internal.impl.DefaultArtifactResolver.resolveArtifact(DefaultArtifactResolver.java:201) at org.eclipse.aether.internal.impl.DefaultRepositorySystem.resolveArtifact(DefaultRepositorySystem.java:260) at org.apache.maven.project.ProjectModelResolver.resolveModel(ProjectModelResolver.java:193) ... 30 more
在排除是因为本地设置的问题后，猜测是Maven的问题，所以开始是各种百度，从Maven3.6.2开始向下试探，结果还是无法解决问题，后来以各种信息分析百度，还是没有解决问题。
在其他配置不变的情况，最后采取的措施是将IDEA从2019.1.2版本降为2018.3.6即可正常导入。
三、总结
在IDEA官网上，都没有找到对应的2019.1.2版本的下载包，就目前情况看，应该是IDEA2019.1.2版本存在某些我不知道的设置或别的情况，所以个人不推荐使用IDEA2019.1.2版本。