Mostly migrate off jsr305.

- Mostly migrate to Checker Framework declaration annotations.
- Migrate @GuardedBy to a custom annotation for now. (We would migrate to Error Prone's, but that's causing me problems as I experiment with JPMS.)

Compare to b/69411537 for Guava.

I've left @ParametersAreNonnullByDefault in place for now, but we'd need to remove it to fully eliminate the jsr305 dep.

RELNOTES=Migrated from jsr305 `@Nullable` to Checker Framework `@NullableDecl`. In addition to the new dependency on the Checker Framework annotations, we keep the dependency on jsr305 for now so that we can keep using `@ParametersAreNonNullByDefault`.

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=272713254

1 files changed, 2 insertions, 2 deletions

diff --git a/jimfs/src/main/java/com/google/common/jimfs/OwnerAttributeProvider.java b/jimfs/src/main/java/com/google/common/jimfs/OwnerAttributeProvider.java
index d102746..3408639 100644
--- a/jimfs/src/main/java/com/google/common/jimfs/OwnerAttributeProvider.java
+++ b/jimfs/src/main/java/com/google/common/jimfs/OwnerAttributeProvider.java
@@ -26,7 +26,7 @@ import java.nio.file.attribute.FileAttributeView;
 import java.nio.file.attribute.FileOwnerAttributeView;
 import java.nio.file.attribute.UserPrincipal;
 import java.util.Map;
-import javax.annotation.Nullable;
+import org.checkerframework.checker.nullness.compatqual.NullableDecl;
 
 /**
  * Attribute provider that provides the {@link FileOwnerAttributeView} ("owner").
@@ -65,7 +65,7 @@ final class OwnerAttributeProvider extends AttributeProvider {
     return ImmutableMap.of("owner:owner", owner);
   }
 
-  @Nullable
+  @NullableDecl
   @Override
   public Object get(File file, String attribute) {
     if (attribute.equals("owner")) {