Dependency name inconsistent in google protobuf 2.5.0

Question

I have an web application which I run in windows and linux environment. In linux and only linux I'm getting following exception:

Caused by:
java.lang.IllegalArgumentException: Invalid embedded descriptor for "moop_shared.proto".
        at com.google.protobuf.Descriptors$FileDescriptor.internalBuildGeneratedFileFrom(Descriptors.java:301)
        ...

Caused by:
com.google.protobuf.Descriptors$DescriptorValidationException: moop_shared.proto: Dependencies passed to FileDescriptor.buildFrom() don't match those listed in the FileDescriptorProto.
        at com.google.protobuf.Descriptors$FileDescriptor.buildFrom(Descriptors.java:246)
        at com.google.protobuf.Descriptors$FileDescriptor.internalBuildGeneratedFileFrom(Descriptors.java:299)
        ...

So I debugged it both locally and remotely comparing the result. I can't understand the following:

Env:

protobuf-java-2.5.0

java 7

---

In both cases I run the very same webapp and I'm on the very same place in code which is com.google.protobuf.Descriptors.java#245 see code

For the context

...
for (int i = 0; i < proto.getDependencyCount(); i++) {
HERE --> if (!dependencies[i].getName().equals(proto.getDependency(i))) {
          throw new DescriptorValidationException(result,
            "Dependencies passed to FileDescriptor.buildFrom() don't match " +
            "those listed in the FileDescriptorProto.");
        }
      }
...

And here are the information from debugger:

Windows:

dependencies[i].getName() = {java.lang.String@3681}"descriptor.proto"
proto.getDependency(i) = {java.lang.String@3682}"descriptor.proto"
dependencies[i].getClass().getProtectionDomain().getCodeSource().getLocation().getPath() = {java.lang.String@3846}"/C:/Apps/Apache/jakarta/tomcat/webapps/ROOT/WEB-INF/lib/protobuf-java-2.5.0.jar"

Linux:

dependencies[i].getName() = {java.lang.String@2444}"google/protobuf/descriptor.proto"
proto.getDependency(i) = {java.lang.String@2445}"descriptor.proto"
dependencies[i].getClass().getProtectionDomain().getCodeSource().getLocation().getPath() = {java.lang.String@2608}"/tmp/jetty-0.0.0.0-8080-cnc-webapp-1.6.3-SNAPSHOT.war-_-any-/webapp/WEB-INF/lib/protobuf-java-2.5.0.jar"

So both dependecies are loaded from the protobuf jar which is byte indetical (checked) but the result of dependencies[i].getName() is different which in the Linux case cause the DescriptorValidationException. This is something which is beside my understanding.

Any help will be much appreciated.

Answer 1

I think this relates to your other question. It is important that a particular .proto file is always imported with exactly the same name. The compiled classes from descriptor.proto are included in the protobuf runtime, and it understands the name to be google/protobuf/descriptor.proto. If you made a copy of descriptor.proto and did not put it into a directory called google/protobuf, but instead just said import "descriptor.proto"; in your own file, you will get this error, because the file names don't match.