GRPC issue with protoc

[gaurav deshpande]

Hi,

Please answer these questions before submitting your issue.

### What version of gRPC are you using?

1.0.2

### What JVM are you using (`java -version`)?

1.8

### What did you do?

If possible, provide a recipe for reproducing the error.

nothing

### What did you see instead?

[ERROR]Failed to execute goal org.xolstice.maven.plugins:protobuf-maven-plugin:0.5.0:compile-custom(default) on project : Unable to copy the file to D:\codebase\api\target\protoc-plugins: D:\codebase\api\target\protoc-plugins\protoc-gen-grpc-java-1.0.2-windows-x86_64.exe

(The process cannot access the file because it is being used by another process)

###Additional info

1)Output of mvn --version

Apache maven 3.2.5

Maven home: C:\gaurav\apache-maven-3.2.5-binary

java version:1.8.0_25, vendor:Oracle corporation

java home: C:\program files\java\jdk1.8.0_25\jre

default local:en_GB, platform encoding:Cp1252

OS name:"windows 7", version:"6.1", arch:"amd64", family:"dos"

Whether you are running Maven inside an IDE, and in that case, which IDE 

      I am using intellij IDEA 2016 as well as command prompt and it gives same error on both.

It's not a public project but I can share plugin configuration with you.

Following are the protoc related things from my root pom.xml

<dependency>

<groupId> io.grpc </groupId>

<artifactId> grpc-protobuf </artifactId>

<version>${grpc.version}</version>

</dependency>

<plugin>

<groupId>org.xolstice.maven.plugins</groupId>

<artifactId>protobuf-maven-plugin</artifactId>

<version>0.5.0</version>

<extensions>true</extensions>

<executions>

<execution>

<goals>

<goal>compile</goal>

<goal>compile-custom</goal>

</goals>

<configuration>

<protocArtifact>com.google.protobuf:protoc:3.0.2:exe:${os.detected.classifier}</protocArtifact>

<pluginId>grpc-java</pluginId>

<pluginArtifact>io.grpc:protoc-gen-grpc-java:${grpc.version}:exe:${os.detected.classifier}</pluginArtifact>

</configuration>

</execution>

</executions>

</plugin>

Following things are from my other module's pom.xml

<dependency>

<groupId>io.grpc</groupId>

<artifactId>grpc-protobuf</artifactId>

<scope>provided</scope>

</dependency>

<plugin>

<groupId>org.xolstice.maven.plugins</groupId>

<artifactId>protobuf-maven-plugin</artifactId>

</plugin>