Java Model Exception: Error in Java Model (code 969): DecimalFormat.class

[rgrunber]

I ran into this attempting to hover (although the stacktrace implies completion was involved) in a file with some token that could not be resolved. I had JavaSE-21 set as my target environment but not sure if that's required. I wasn't able to reproduce, nor did it appear to be harmful but it happened pretty frequently.

!ENTRY org.eclipse.jdt.core.manipulation 4 10001 2024-02-05 13:54:13.629
!MESSAGE Internal Error
!STACK 1
Java Model Exception: Error in Java Model (code 969): DecimalFormat.class [in java.text [in <module:java.base>]] does not exist
	at org.eclipse.jdt.internal.core.JavaElement.newNotPresentException(JavaElement.java:562)
	at org.eclipse.jdt.internal.core.ClassFile.getBinaryTypeInfo(ClassFile.java:202)
	at org.eclipse.jdt.internal.core.ClassFile.buildStructure(ClassFile.java:91)
	at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:265)
	at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:585)
	at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:308)
	at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:294)
	at org.eclipse.jdt.internal.core.BinaryType.getClassFileInfo(BinaryType.java:232)
	at org.eclipse.jdt.internal.core.BinaryType.getChildren(BinaryType.java:195)
	at org.eclipse.jdt.internal.core.JavaElement.getChildrenOfType(JavaElement.java:263)
	at org.eclipse.jdt.internal.core.BinaryType.getMethods(BinaryType.java:494)
	at org.eclipse.jdt.internal.ui.viewsupport.CoreJavaElementLinks.parseURI(CoreJavaElementLinks.java:238)
	at org.eclipse.jdt.ls.core.internal.javadoc.JavadocContentAccess2$JdtLsJavadocAccessImpl.createLinkURI(JavadocContentAccess2.java:310)
	at org.eclipse.jdt.core.manipulation.internal.javadoc.CoreJavadocAccessImpl.handleLink(CoreJavadocAccessImpl.java:1477)
	at org.eclipse.jdt.core.manipulation.internal.javadoc.CoreJavadocAccessImpl.handleInlineTagElement(CoreJavadocAccessImpl.java:935)
	at org.eclipse.jdt.core.manipulation.internal.javadoc.CoreJavadocAccessImpl.handleContentElements(CoreJavadocAccessImpl.java:775)
	at org.eclipse.jdt.core.manipulation.internal.javadoc.CoreJavadocAccessImpl.handleContentElements(CoreJavadocAccessImpl.java:733)
	at org.eclipse.jdt.core.manipulation.internal.javadoc.CoreJavadocAccessImpl.elementToHTML(CoreJavadocAccessImpl.java:352)
	at org.eclipse.jdt.core.manipulation.internal.javadoc.CoreJavadocAccessImpl.toHTML(CoreJavadocAccessImpl.java:162)
	at org.eclipse.jdt.core.manipulation.internal.javadoc.CoreJavadocAccess.javadoc2HTML(CoreJavadocAccess.java:436)
	at org.eclipse.jdt.core.manipulation.internal.javadoc.CoreJavadocAccess.getHTMLContentFromSource(CoreJavadocAccess.java:369)
	at org.eclipse.jdt.core.manipulation.internal.javadoc.CoreJavadocAccess.getHTMLContent(CoreJavadocAccess.java:230)
	at org.eclipse.jdt.ls.core.internal.javadoc.JavadocContentAccess2.getMarkdownContentReader(JavadocContentAccess2.java:74)
	at org.eclipse.jdt.ls.core.internal.handlers.CompletionResolveHandler.lambda$0(CompletionResolveHandler.java:265)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
!SUBENTRY 1 org.eclipse.jdt.core 4 969 2024-02-05 13:54:13.629
!MESSAGE DecimalFormat.class [in java.text [in <module:java.base>]] does not exist

[rgrunber]

CC'ing @robstryker @fbricon as requested. Here's the snippet behaviour I was referring to :

Note : This is only a problem on a Java 21 EE (in fact probably Java 18+ since that's when javadoc snippets were introduced). On Java 17, it looks just fine.

Java 21

Java 21

Java 17