JDK-8268582: javadoc throws NPE with --ignore-source-errors option

[hns]

Please review a simple fix for a javadoc NPE when using the undocumented --ignore-source-errors option with an non-existing type.

Note that this just fixes the particular error that occurs when looking for preview API use in invalid types. It is possible that other source errors trigger other errors in javadoc, but I don't think it is worth the time to go and actively look for them.

In particular, the NPE that is documented by the stack trace in the JBS issue was different from the one fixed here and does not occur anymore, and the one fixed here did not yet exist in JDK 11.

---

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Issue

• JDK-8268582: javadoc throws NPE with --ignore-source-errors option

Reviewers

• Jonathan Gibbons (@jonathan-gibbons - Reviewer)

Reviewing

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Webrevs

• 00: Full (db08127c)

[openjdk]

@hns This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8268582: javadoc throws NPE with --ignore-source-errors option

Reviewed-by: jjg

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At the time when this comment was updated there had been 121 new commits pushed to the master branch:

• a363b7b: 8177819: DateTimeFormatterBuilder zone parsing should recognise DST
• 9b3e672: 8278014: [vectorapi] Remove test run script
• 1e9ed54: 8193682: Infinite loop in ZipOutputStream.close()
• abaa073: 8277946: NMT: Deprecate and remove VM.native_memory shutdown jcmd command option
• 37ff7f3: 8277866: gc/epsilon/TestMemoryMXBeans.java failed with wrong initial heap size
• 8d7958e: 8277981: String Deduplication table is never cleaned up due to bad dead_factor_for_cleanup
• bc6dce1: 8277736: G1: Allow forced evacuation failure of first N regions in collection set
• 0c29ee5: 8274319: Replace usages of Collections.sort with List.sort call in jdk.jfr
• f505396: 8277459: Add jwebserver tool
• 84aa0a1: 8278047: Few javax/imageio test regressed after JDK-8262297 fix
• ... and 111 more: https://git.openjdk.java.net/jdk/compare/32839ba012f0a0a66e249cd8d12b94499d82ec0a...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[hns]

/integrate

[openjdk]

Going to push as commit 0dfb3a7.
Since your change was applied there have been 122 commits pushed to the master branch:

• f41e768: 8277762: Allow configuration of HOTSPOT_BUILD_USER
• a363b7b: 8177819: DateTimeFormatterBuilder zone parsing should recognise DST
• 9b3e672: 8278014: [vectorapi] Remove test run script
• 1e9ed54: 8193682: Infinite loop in ZipOutputStream.close()
• abaa073: 8277946: NMT: Deprecate and remove VM.native_memory shutdown jcmd command option
• 37ff7f3: 8277866: gc/epsilon/TestMemoryMXBeans.java failed with wrong initial heap size
• 8d7958e: 8277981: String Deduplication table is never cleaned up due to bad dead_factor_for_cleanup
• bc6dce1: 8277736: G1: Allow forced evacuation failure of first N regions in collection set
• 0c29ee5: 8274319: Replace usages of Collections.sort with List.sort call in jdk.jfr
• f505396: 8277459: Add jwebserver tool
• ... and 112 more: https://git.openjdk.java.net/jdk/compare/32839ba012f0a0a66e249cd8d12b94499d82ec0a...master

Your commit was automatically rebased without conflicts.

[openjdk]

@hns Pushed as commit 0dfb3a7.

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