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From "Julian Hyde (JIRA)" <j...@apache.org>
Subject [jira] [Created] (CALCITE-3240) Javadoc gives internal error "com.sun.tools.javac.code.ClassFinder$BadClassFile: bad class file: linq4j/target/classes/org/apache/calcite/linq4j/Ord$2.class [ERROR] undeclared type variable: E"
Date Sun, 11 Aug 2019 20:18:00 GMT
Julian Hyde created CALCITE-3240:
------------------------------------

             Summary: Javadoc gives internal error "com.sun.tools.javac.code.ClassFinder$BadClassFile:
bad class file: linq4j/target/classes/org/apache/calcite/linq4j/Ord$2.class [ERROR]   undeclared
type variable: E"
                 Key: CALCITE-3240
                 URL: https://issues.apache.org/jira/browse/CALCITE-3240
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde


Javadoc gives an internal error on JDK 9 (version 9.0.4) and JDK 10 (version 10.0.2):

{noformat}
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-javadoc-plugin:3.0.1:test-javadoc
(default-cli) on project calcite-linq4j: An error has occurred in Test Javadoc report generation:

[ERROR] Exit code: 1 - javadoc: error - An internal exception has occurred. 
[ERROR] 	(com.sun.tools.javac.code.ClassFinder$BadClassFile: bad class file: /home/jhyde/open1/calcite.2/linq4j/target/classes/org/apache/calcite/linq4j/Ord$2.class
[ERROR]   undeclared type variable: E
[ERROR]   Please remove or make sure it appears in the correct subdirectory of the classpath.)
[ERROR] Please file a bug against the javadoc tool via the Java bug reporting page
[ERROR] (http://bugreport.java.com) after checking the Bug Database (http://bugs.java.com)
[ERROR] for duplicates. Include error messages and the following diagnostic in your report.
Thank you.
[ERROR] com.sun.tools.javac.code.ClassFinder$BadClassFile: bad class file: /home/jhyde/open1/calcite.2/linq4j/target/classes/org/apache/calcite/linq4j/Ord$2.class
[ERROR]   undeclared type variable: E
[ERROR]   Please remove or make sure it appears in the correct subdirectory of the classpath.
[ERROR] 	at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.badClassFile(ClassReader.java:281)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.findTypeVar(ClassReader.java:966)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.readEnclosingMethodAttr(ClassReader.java:1463)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.jvm.ClassReader$10.read(ClassReader.java:1173)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.readAttrs(ClassReader.java:1549)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.readClassAttrs(ClassReader.java:1563)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.readClass(ClassReader.java:2625)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.readClassBuffer(ClassReader.java:2718)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.jvm.ClassReader.readClassFile(ClassReader.java:2731)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.code.ClassFinder.fillIn(ClassFinder.java:352)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.code.ClassFinder.complete(ClassFinder.java:284)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.code.Symbol.complete(Symbol.java:633)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.code.Symbol$ClassSymbol.complete(Symbol.java:1308)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.code.Symbol$ClassSymbol.flags(Symbol.java:1242)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.code.Symbol$TypeSymbol.getEnclosedElements(Symbol.java:800)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.getItems0(Utils.java:2404)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.getItems0(Utils.java:2399)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.recursiveGetItems(Utils.java:2387)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils$17.visitPackage(Utils.java:2372)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils$17.visitPackage(Utils.java:2368)
[ERROR] 	at jdk.compiler/com.sun.tools.javac.code.Symbol$PackageSymbol.accept(Symbol.java:1160)
[ERROR] 	at java.compiler@10.0.2/javax.lang.model.util.AbstractElementVisitor6.visit(AbstractElementVisitor6.java:106)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.getItems(Utils.java:2381)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.getClasses(Utils.java:2121)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.util.Utils.getAllClasses(Utils.java:2294)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.AbstractDoclet.generateClassFiles(AbstractDoclet.java:277)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.AbstractDoclet.startGeneration(AbstractDoclet.java:211)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.doclets.toolkit.AbstractDoclet.run(AbstractDoclet.java:117)
[ERROR] 	at jdk.javadoc/jdk.javadoc.doclet.StandardDoclet.run(StandardDoclet.java:72)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.tool.Start.parseAndExecute(Start.java:581)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:430)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.tool.Start.begin(Start.java:343)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.tool.Main.execute(Main.java:63)
[ERROR] 	at jdk.javadoc/jdk.javadoc.internal.tool.Main.main(Main.java:52)
[ERROR] 
[ERROR] Command line was: /usr/lib/jvm/jdk-10/bin/javadoc @options @packages
[ERROR] 
[ERROR] Refer to the generated Javadoc files in 'linq4j/target/site/testapidocs' dir.
{noformat}

This occurs in my dev branch for CALCITE-1935, but I am just about to merge that into master,
so it will start happening on master.

The error is reported in {{Ord.java}}, but there are no recent changes to that file. If I
change that file (e.g. renaming all type variables called {{E}} to distinct names {{E1}},
{{E2}} etc.) the error pops up in {{EnumerableDefaults.java}}. So, it seems to be a problem
with {{javadoc}}, not our code.



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