FULL PRODUCT VERSION : java version "1.8.0_25" Java(TM) SE Runtime Environment (build 1.8.0_25-b17) Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode) A DESCRIPTION OF THE PROBLEM : I got exception when compiling this code: import java.util.Collection; public class CollectionUtils { public static boolean nullsOnly(Collection<?> collection) { return collection.stream(). reduce(true, (collector, value) -> collector && (value == null), (collector1, collector2) -> collector1 && collector2); } } I am trying to write a test for it but I can't compile it - I am not sure if it does what is should. Exception from console (maven build) but Intellij also crashes compilation. An exception has occurred in the compiler (1.8.0_25). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you. java.lang.NullPointerException at com.sun.tools.javac.code.Types.isConvertible(Types.java:290) at com.sun.tools.javac.comp.Check.assertConvertible(Check.java:922) at com.sun.tools.javac.comp.Check.checkMethod(Check.java:876) at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3838) at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3615) at com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3522) at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3501) at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3488) at com.sun.tools.javac.comp.Attr.visitSelect(Attr.java:3370) at com.sun.tools.javac.tree.JCTree$JCFieldAccess.accept(JCTree.java:1897) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607) at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1843) at com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1465) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607) at com.sun.tools.javac.comp.Attr.visitReturn(Attr.java:1704) at com.sun.tools.javac.tree.JCTree$JCReturn.accept(JCTree.java:1384) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676) at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:692) at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1142) at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:909) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676) at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1035) at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:778) at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:607) at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:676) at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4342) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4252) at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4181) at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4156) at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1248) at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:901) at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:860) at com.sun.tools.javac.main.Main.compile(Main.java:523) at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129) at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138) at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess(JavaxToolsCompiler.java:126) at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile(JavacCompiler.java:170) at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:684) at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:118) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:133) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:108) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:76) at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:116) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:361) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:155) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:213) at org.apache.maven.cli.MavenCli.main(MavenCli.java:157) 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:483) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356) [ REPRODUCIBILITY : This bug can be reproduced always.
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