java/core/src/test/java/com/google/protobuf/DescriptorsTest.java:68: error: cannot find symbol
import protobuf_unittest.UnittestRetention;
                        ^
  symbol:   class UnittestRetention
  location: package protobuf_unittest
java/core/src/test/java/com/google/protobuf/DescriptorsTest.java:402: error: cannot find symbol
    FileOptions options = UnittestRetention.getDescriptor().getOptions();
                          ^
  symbol:   variable UnittestRetention
  location: class DescriptorsTest
java/core/src/test/java/com/google/protobuf/DescriptorsTest.java:403: error: cannot find symbol
    assertThat(options.hasExtension(UnittestRetention.plainOption)).isTrue();
                                    ^
  symbol:   variable UnittestRetention
  location: class DescriptorsTest
java/core/src/test/java/com/google/protobuf/DescriptorsTest.java:404: error: cannot find symbol
    assertThat(options.hasExtension(UnittestRetention.runtimeRetentionOption)).isTrue();
                                    ^
  symbol:   variable UnittestRetention
  location: class DescriptorsTest
java/core/src/test/java/com/google/protobuf/DescriptorsTest.java:405: error: cannot find symbol
    assertThat(options.hasExtension(UnittestRetention.sourceRetentionOption)).isFalse();
                                    ^
  symbol:   variable UnittestRetention
  location: class DescriptorsTest
--- a/java/core/generate-test-sources-build.xml
+++ b/java/core/generate-test-sources-build.xml
@@ -19,6 +19,7 @@
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_optimize_for.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_proto3.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_proto3_optional.proto"/>
+        <arg value="${protobuf.source.dir}/google/protobuf/unittest_retention.proto"/>
         <arg value="${protobuf.source.dir}/google/protobuf/unittest_well_known_types.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/any_test.proto"/>
         <arg value="${test.proto.dir}/com/google/protobuf/cached_field_size_test.proto"/>