chore(java): fix GetEncryptedDataKeyDescription java Example (#1973)

Author: rishav-karanjit

Examples/runtimes/java/DynamoDbEncryption/src/test/java/software/amazon/cryptography/examples/TestGetEncryptedDataKeyDescriptionExample.java

@@ -1,21 +1,44 @@
 package software.amazon.cryptography.examples;
 
+import java.util.UUID;
 import org.testng.annotations.Test;
 
 public class TestGetEncryptedDataKeyDescriptionExample {
 
   @Test
   public void TestGetEncryptedDataKeyDescription() {
+    final String partitionKeyValue =
+      "GetEncryptedDataKeyDescriptionExample" + UUID.randomUUID();
+    final String partitionKeyName = "partition_key";
+    final String sortKeyValue = "0";
+    final String sortKeyName = "sort_key";
+    // `getEncryptedDataKeyDescription` assumes that there is already existing item in dynamodb.
+    // So, we need to run `PutItemGetItem` before `getEncryptedDataKeyDescription`
+    BasicPutGetExample.PutItemGetItem(
+      TestUtils.TEST_KMS_KEY_ID,
+      TestUtils.TEST_DDB_TABLE_NAME,
+      partitionKeyName,
+      sortKeyName,
+      partitionKeyValue,
+      sortKeyValue
+    );
     GetEncryptedDataKeyDescriptionExample.getEncryptedDataKeyDescription(
       TestUtils.TEST_DDB_TABLE_NAME,
-      "partition_key",
-      "BasicPutGetExample",
-      "sort_key",
-      "0",
+      partitionKeyName,
+      partitionKeyValue,
+      sortKeyName,
+      sortKeyValue,
       "aws-kms",
       TestUtils.TEST_KMS_KEY_ID,
       null,
       null
     );
+    TestUtils.cleanUpDDBItem(
+      TestUtils.TEST_DDB_TABLE_NAME,
+      partitionKeyName,
+      sortKeyName,
+      partitionKeyValue,
+      sortKeyValue
+    );
   }
 }