Hi, there are multiple versions of com.google.guava:guava:jar in mil.nga.giat:geowave-grpc-protobuf-shaded:jar:0.9.7. Due to Maven version management, only com.google.guava:guava:jar:14.0-rc1 can be loaded and the other versions will be shadowed during the packaging process.

However, class com/google/common/base/MoreObjects only defined in the shadowed version com.google.guava:guava:jar:19.0. As a result, an exception will be thrown when your project referencing the missing class.

Stack trace

Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/base/MoreObjects
at io.grpc.internal.AbstractManagedChannelImplBuilder.build(AbstractManagedChannelImplBuilder.java:284)
at Test1.main(Test1.java:7)
Caused by: java.lang.ClassNotFoundException: com.google.common.base.MoreObjects
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 2 more

Using the following test case you can reproduce this problem.
Test1.txt

Dependency tree

mil.nga.giat:geowave-grpc-protobuf-shaded:jar:0.9.7
+- io.grpc:grpc-protobuf:jar:1.2.0:compile
| +- io.grpc:grpc-core:jar:1.2.0:compile
| | +- (com.google.guava:guava:jar:14.0-rc1:compile - version managed from 19.0; omitted for duplicate)
| | +- com.google.errorprone:error_prone_annotations:jar:2.0.11:compile
| | +- com.google.code.findbugs:jsr305:jar:3.0.0:compile
| | +- io.grpc:grpc-context:jar:1.2.0:compile
| | - com.google.instrumentation:instrumentation-api:jar:0.3.0:compile
| | - (com.google.code.findbugs:jsr305:jar:3.0.0:compile - omitted for duplicate)
| +- com.google.protobuf:protobuf-java:jar:3.2.0:compile
| +- com.google.guava:guava:jar:14.0-rc1:compile
| +- com.google.protobuf:protobuf-java-util:jar:3.2.0:compile
| | +- (com.google.protobuf:protobuf-java:jar:3.2.0:compile - omitted for duplicate)
| | +- (com.google.guava:guava:jar:14.0-rc1:compile - version managed from 18.0; omitted for duplicate)
| | - com.google.code.gson:gson:jar:2.7:compile
| - io.grpc:grpc-protobuf-lite:jar:1.2.0:compile
| +- (io.grpc:grpc-core:jar:1.2.0:compile - omitted for duplicate)
| - (com.google.guava:guava:jar:14.0-rc1:compile - version managed from 19.0; omitted for duplicate)
+- io.grpc:grpc-stub:jar:1.2.0:compile
| - (io.grpc:grpc-core:jar:1.2.0:compile - omitted for duplicate)
+- org.slf4j:slf4j-log4j12:jar:1.7.21:compile
| +- org.slf4j:slf4j-api:jar:1.7.21:compile
| - log4j:log4j:jar:1.2.17:compile
- junit:junit:jar:4.11:test
- org.hamcrest:hamcrest-core:jar:1.3:test

Solution

Upgrade guava to version 19.0.

Please let me know if you need stack trace or test case to investigate this issue. I can try to provide you more information.

Thanks a lot.

Regards,
Leo