ACCUMULO-3576 Use guava's preconditions, not jline's
diff --git a/core/src/main/java/org/apache/accumulo/core/client/security/tokens/CredentialProviderToken.java b/core/src/main/java/org/apache/accumulo/core/client/security/tokens/CredentialProviderToken.java
index baae411..d8ebc4a 100644
--- a/core/src/main/java/org/apache/accumulo/core/client/security/tokens/CredentialProviderToken.java
+++ b/core/src/main/java/org/apache/accumulo/core/client/security/tokens/CredentialProviderToken.java
@@ -21,12 +21,12 @@
 import java.util.LinkedHashSet;
 import java.util.Set;
 
-import jline.internal.Preconditions;
-
 import org.apache.accumulo.core.conf.CredentialProviderFactoryShim;
 import org.apache.accumulo.core.util.CachedConfiguration;
 import org.apache.hadoop.conf.Configuration;
 
+import com.google.common.base.Preconditions;
+
 /**
  * An {@link AuthenticationToken} backed by a Hadoop CredentialProvider.
  */
diff --git a/core/src/main/java/org/apache/accumulo/core/conf/CredentialProviderFactoryShim.java b/core/src/main/java/org/apache/accumulo/core/conf/CredentialProviderFactoryShim.java
index 81fe540..3c3c051 100644
--- a/core/src/main/java/org/apache/accumulo/core/conf/CredentialProviderFactoryShim.java
+++ b/core/src/main/java/org/apache/accumulo/core/conf/CredentialProviderFactoryShim.java
@@ -23,13 +23,13 @@
 import java.util.Collections;
 import java.util.List;
 
-import jline.internal.Preconditions;
-
 import org.apache.accumulo.core.util.CachedConfiguration;
 import org.apache.hadoop.conf.Configuration;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
+import com.google.common.base.Preconditions;
+
 /**
  * Shim around Hadoop: tries to use the CredentialProviderFactory provided by hadoop-common, falling back to a copy inside accumulo-core.
  * <p>