mvn test (without clean) gives 'io.github.blackrock:protoc-maven-plugin:2.0.0:run failed: Cannot read the array length because "<local6>" is null'

[cmardini]

Describe the bug
In my project, when the protos aren't generated into sources but I try to run tests with 'mvn test', I get:

Execution default of goal io.github.blackrock:protoc-maven-plugin:2.0.0:run failed: Cannot read the array length because "<local6>" is null

But adding clean to the cmd line, I don't get this issue.

My plugin section looks like:

            <plugin>
                <groupId>io.github.blackrock</groupId>
                <artifactId>protoc-maven-plugin</artifactId>
                <version>2.0.0</version>
                <executions>
                    <execution>
                        <phase>generate-sources</phase>
                        <goals>
                            <goal>run</goal>
                        </goals>
                        <configuration>
                            <optimizeCodegen>true</optimizeCodegen>
                            <includeMavenTypes>direct</includeMavenTypes>
                            <includeStdTypes>true</includeStdTypes>
                            <includeDirectories>
                                <include>src/main/protobuf/include</include>
                                <include>src/main/protobuf/a-proto</include>
                            </includeDirectories>
                            <inputDirectories>
                                <include>src/main/protobuf/c-proto</include>
                                <include>src/main/protobuf/b-proto</include>
                                <include>src/main/protobuf/a-proto</include>
                            </inputDirectories>
                            <outputTargets>
                                <outputTarget>
                                    <type>java</type>
                                </outputTarget>
                                <outputTarget>
                                    <type>grpc-java</type>
                                    <pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}</pluginArtifact>
                                </outputTarget>
                            </outputTargets>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

Environment (please complete the following information):

• CentOS 7
• Maven 3.9.1

Additional context
Using 2.0.0

[spensonshih]

Thanks @cmardini for reporting. I have identified the bug, and will issue a fix. The bug is due to an uninitialized variable when skipping code generation (because mvn clean is not specified), and the includeStdTypes flag is set.

[cmardini]

Thanks. I've removed includeStdTypes in my project in the meantime. Seems like I no longer needed it.

[spensonshih]

This has been resolved in patch release 2.0.1.