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Switch from Guava Optionals to Java 8 Optionals

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This was a surprisingly involved change. Some of the difficulties included
java.util.Optional purposely not being Serializable (so I had to move a
few Optionals in mapreduce classes to @Nullable) and having to add the Truth
Java8 extension library for assertion support.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=171863777
This commit is contained in:
mcilwain 2017-10-11 13:09:26 -07:00 • committed by jianglai
parent 184b2b56ac
commit c0f8da0c6e
581 changed files with 1325 additions and 932 deletions
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java/google/registry/util/PreconditionsUtils.java
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@ -16,7 +16,7 @@ package google.registry.util;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.base.Optional;
import java.util.Optional;
import javax.annotation.Nullable;
/** Utility methods related to preconditions checking. */