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why do I not find generated source files for grpc and protobuf when using maven and java in vscode

I have a pom file that correctly generates the grpc and protobuf source files I need in target/generated-sources when run from the command line. But when I build in vscode those directories are empty and references to the protobufs are undefined. Here's the section of my pom file that builds the grpc source.
<plugin>
<groupId>org.xolstice.maven.plugins</groupId>
<artifactId>protobuf-maven-plugin</artifactId>
<version>0.5.0</version>
<configuration>
<protocArtifact>com.google.protobuf:protoc:3.2.0:exe:${os.detected.classifier}</protocArtifact>
<pluginId>grpc-java</pluginId>
<pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}</pluginArtifact>
</configuration>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>compile-custom</goal>
</goals>
</execution>
</executions>
</plugin>
I added the following based on what I read in other posts to prevent vscode/eclipse from removing the generated source directories
<plugin>
<groupId>org.xolstice.maven.plugins</groupId>
<artifactId>protobuf-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>target/generated-sources/protobuf/grpc-java</source>
<source>/target/generated-sources/protobuf/java</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
When vs-code builds, the target generated-source directories are there, but there is no source in them. We had a similar problem with intellij but were able to work around it by running the maven command line build before opening intellij but that does not seem to work for vscode.

Use protoc-jar-maven-plugin instead.
Sample usage please view protoc-jar-maven-plugin.

Add generated Apache Avro source with build-helper-maven-plugin

I'm using Apache avro to generate some pojos, all work very well in run, expect that the generated source is marked as inexistent in imports on IDE (intellij) .
I tried to use build-helper-maven-plugin to add source, but it doesn't work
this is my maven configuration for apache avro and build helper plugins :
<plugin>
<groupId>org.apache.avro</groupId>
<artifactId>avro-maven-plugin</artifactId>
<version>${avro.version}</version>
<configuration>
<stringType>String</stringType>
</configuration>
<executions>
<execution>
<phase>generate-sources</phase>
<goals>
<goal>schema</goal>
</goals>
<configuration>
<sourceDirectory>${project.basedir}/src/main/avro/</sourceDirectory>
<outputDirectory>${project.build.directory}/generated-sources/</outputDirectory>
<imports>
<import>${project.basedir}/src/main/avro/errorkind.avsc</import>
</imports>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>3.2.0</version>
<executions>
<execution>
<id>add-source</id>
<phase>generate-sources</phase>
<goals>
<goal>add-source</goal>
</goals>
<configuration>
<sources>
<source>${project.build.directory}/generated-sources</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>

Try changing your pom with following and run clean install and then you should be able to import.
<configuration>
<sourceDirectory>${project.basedir}/src/main/resources/</sourceDirectory>
<source>${project.build.directory}/generated-sources</source>
</configuration>
In POM InteliJ may give you a fake error after adding this but your build will success.

"generated-sources" reside under ${project.build.directory}/target folder
Also, try marking "generated-sources" as source directory. You can do that by:
Project Structure → Modules → Click the generated-sources folder and make it a sources folder.

Exclude packages while generating sources jar in Maven

I would like to generate a sources jar but without some packages in my project.
Now I have this in my pom.xml
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-source-plugin</artifactId>
<executions>
<execution>
<id>sources</id>
<goals>
<goal>jar</goal>
<goal>test-jar</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
How to exclude specific packages?
similar but with netbeans environment

You can configure the maven-source-plugin with the excludes attribute:
List of files to exclude. Specified as fileset patterns which are relative to the input directory whose contents is being packaged into the JAR.
A sample configuration where you would exclude every class under the package com.my.package would be the following:
<plugin>
<artifactId>maven-source-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<id>sources</id>
<goals>
<goal>jar</goal>
<goal>test-jar</goal>
</goals>
<phase>package</phase>
<configuration>
<excludes>
<exclude>com/my/package/**</exclude>
</excludes>
</configuration>
</execution>
</executions>
</plugin>

How to make PMD run at the start of the maven build rather than at the end of it?

I have the following configuration within my pom.xml that checks for PMD violations:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pmd-plugin</artifactId>
<version>${pmd.version}</version>
<configuration>
<linkXRef>true</linkXRef>
<sourceEncoding>UTF-8</sourceEncoding>
<minimumTokens>100</minimumTokens>
<targetJdk>1.7</targetJdk>
</configuration>
<executions>
<execution>
<goals>
<goal>check</goal>
<goal>cpd-check</goal>
</goals>
</execution>
</executions>
</plugin>
When I run a build using the command mvn clean install, the PMD checks are run as last step of the build process. Rather, I would want the PMD checks to run as the first step of the build.
Does anybody know how could I achieve this?

Add the phase element to your POM.
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pmd-plugin</artifactId>
<version>${pmd.version}</version>
<configuration>
<linkXRef>true</linkXRef>
<sourceEncoding>UTF-8</sourceEncoding>
<minimumTokens>100</minimumTokens>
<targetJdk>1.7</targetJdk>
</configuration>
<executions>
<execution>
<phase>validate</phase>
<goals>
<goal>check</goal>
<goal>cpd-check</goal>
</goals>
</execution>
</executions>
</plugin>
The validate phase is the first phase of the maven lifecycle: http://maven.apache.org/guides/introduction/introduction-to-the-lifecycle.html

Thanks for your answers #JamesB and #PetrMensik for letting me know about the phase element within the POM. It helped me solve my problem. I finally settled for this:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pmd-plugin</artifactId>
<version>${pmd.version}</version>
<configuration>
<linkXRef>true</linkXRef>
<sourceEncoding>UTF-8</sourceEncoding>
<minimumTokens>100</minimumTokens>
<targetJdk>1.7</targetJdk>
</configuration>
<executions>
<execution>
<phase>compile</phase>
<goals>
<goal>check</goal>
<goal>cpd-check</goal>
</goals>
</execution>
</executions>
</plugin>
I used the phase:compile, the reason being I have plenty of tests in my project which take up a lot of time to execute. And, its quite irritating to wait for those tests to finish and be notified about a PMD violation at the end of all the tests. I needed something just before the tests. Hence, I settled for compile.
Further suggestions are welcome. :)

You need to hook execution of this plugin to a different Maven lifecycle phase (validation comes as the first one in default lifecycle).
<executions>
<execution>
<phase>validate</phase>
<goals>
<goal>check</goal>
<goal>cpd-check</goal>
</goals>
</execution>
</executions>
See this the list of the available Maven phases for reference.

I set build configuration
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-pmd-plugin</artifactId>
<version>${pmd.plugin.version}</version>
<configuration>
<failOnViolation>true</failOnViolation>
<printFailingErrors>true</printFailingErrors>
</configuration>
<executions>
<execution>
<goals>
<goal>check</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>

Maven: How to handle generated sources for test(only)?

Usually generated sources should be created in the target dir. But how do I handle classes that are only used for test? I dont want that these classes get packaged in my jar. Is there a common way to deal with this situation?

Use maven build helper plugin's add-test-source goal to add your generated test source files to the build -> http://mojo.codehaus.org/build-helper-maven-plugin/add-test-source-mojo.html
It ensures that the directories added by this goal will be picked up automatically by the compiler plugin during test-compile phase of the build.
EDIT
Here is the example of how to generate code for testign with cxf-codegen-plugin
<build>
<plugins>
...
<plugin>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-codegen-plugin</artifactId>
<version>${cxf.version}</version>
<executions>
<execution>
<id>generate-test-sources</id>
<phase>generate-test-sources</phase>
<configuration>
<sourceRoot>${project.build.directory}/generated/cxf</sourceRoot>
<wsdlOptions>
<wsdlOption>
<wsdl>${basedir}/src/main/wsdl/myService.wsdl</wsdl>
</wsdlOption>
</wsdlOptions>
</configuration>
<goals>
<goal>wsdl2java</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>build-helper-maven-plugin</artifactId>
<version>${build-helper-maven-plugin.version}</version>
<executions>
<execution>
<id>add-test-sources</id>
<phase>generate-test-sources</phase>
<goals>
<goal>add-test-source</goal>
</goals>
<configuration>
<sources>
<source>${project.build.directory}/generated/cxf</source>
</sources>
</configuration>
</execution>
</executions>
</plugin>
...
</plugins>
</build>