some classes cannot be resolved for vector component

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some classes under package arrow Vector has compiling error because some dependency class cannot be resolved(not exists). Affected packages of classes can be seen in attachment 2(2).png.

Reporter: Fangzhou

Original Issue Attachments:

• 1 (2).png
• 2 (2).png

_{Note: This issue was originally created as ARROW-192. Please see the migration documentation for further details.}

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Laurent Goujon / @laurentgo:
The maven plugin which generates these classes is not run automatically by Eclipse. As a workaround, ou can run manually mvn generate-sources to create those, and refresh your project in the IDE.

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Fangzhou:
could you specify the details of doing this?I followed what you said but the problem still exists.
Following is my steps:

1. git clone project apache/arrow
2. setup maven,configure MAVEN_HOME,PATH
3. execute mvn generate-sources command under folder ./arrow , ./arrow/java and ./arrow/java/vector (pom.xml)

Also, I find those unresolved classes also cannot be seen in Mirror of Apache Arrow folder

https://github.com/apache/arrow/tree/master/java/vector/src/main/java/org/apache/arrow/vector

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Laurent Goujon / @laurentgo:
These classes are generated by the build and are not stored in git. If the maven command ran successfully, you should see those classes under target ./vector/target/generated-sources. And if you are using the m2e plugin to import your maven project into eclipse, you should those classes in there too. Otherwise you would have to add the extra source directory manually.

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Fangzhou:
I think I solve the problem because I can see all classes under generated-sources.It is ok now. Thank you.
But the question is where is the place to merge fix version of those classes which are not stored in git?

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Laurent Goujon / @laurentgo:
The templates are under vector/src/main/codegen. Modify the template and check the resulting classes.

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Fangzhou:
solved unresolved problem per discussed