fix try block

Issue-ID: POLICY-961

Change-Id: Ia1f388368007a4a82a57520dc6ddd99cc484a393
Signed-off-by: Krishnajinka <kris.jinka@samsung.com>

7 files changed, 30 insertions, 55 deletions

diff --git a/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/PAPRestConfig.java b/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/PAPRestConfig.java
index 1b9afe547..7e514ef24 100644
--- a/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/PAPRestConfig.java
+++ b/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/PAPRestConfig.java
@@ -57,9 +57,8 @@ public class PAPRestConfig extends WebMvcConfigurerAdapter {
 	@PostConstruct
 	public void init(){
 		Properties prop = new Properties();
-		InputStream input = null;
-		try {
-			input = new FileInputStream("xacml.pap.properties");
+
+		try(InputStream input = new FileInputStream("xacml.pap.properties")) {
 			// load a properties file
 			prop.load(input);
 			setDbDriver(prop.getProperty("javax.persistence.jdbc.driver"));
@@ -68,14 +67,6 @@ public class PAPRestConfig extends WebMvcConfigurerAdapter {
 			setDbPassword( CryptoUtils.decryptTxtNoExStr(prop.getProperty("javax.persistence.jdbc.password", "")));
 		}catch(Exception e){
 			LOGGER.error("Exception Occured while loading properties file"+e);
-		}finally{
-			if(input != null){
-				try {
-					input.close();
-				} catch (IOException e) {
-					LOGGER.error("Exception Occured while clsoing the stream"+e);
-				}
-			}
 		}
 	}
 	
diff --git a/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/ConfigPolicy.java b/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/ConfigPolicy.java
index 48eb784a7..b808e5882 100644
--- a/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/ConfigPolicy.java
+++ b/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/ConfigPolicy.java
@@ -80,24 +80,15 @@ public class ConfigPolicy extends Policy {
 	
 	// Saving the Configurations file at server location for config policy.
 	protected void saveConfigurations(String policyName) {
-	        BufferedWriter bw = null;
-		try {
-			String fileName = getConfigFile(policyName);
-			bw = new BufferedWriter(new FileWriter(CONFIG_HOME + File.separator + fileName));
+
+		String fileName = getConfigFile(policyName);
+		try(BufferedWriter bw = new BufferedWriter(new FileWriter(CONFIG_HOME + File.separator + fileName))) {
 			bw.write(configBodyData);
 			if (LOGGER.isDebugEnabled()) {
 			    LOGGER.debug("Configuration is succesfully saved");
 			}
 		} catch (IOException e) {
 			LOGGER.error("Exception Occured while writing Configuration Data"+e);
-		} finally {
-		    if(bw != null){
-                    try {
-                        bw.close();
-                    } catch (Exception e) {
-                        LOGGER.error("Exception Occured while closing the BufferedWriter"+e);
-                    }
-               }
 		}
 	}
 
diff --git a/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/CreateNewMicroServiceModel.java b/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/CreateNewMicroServiceModel.java
index 7757c2f19..0679e79d8 100644
--- a/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/CreateNewMicroServiceModel.java
+++ b/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/CreateNewMicroServiceModel.java
@@ -185,9 +185,8 @@ public class CreateNewMicroServiceModel {
 	    int BUFFER = 2048;
 	    File file = new File(zipFile);
 
-	    ZipFile zip = null;
-		try {
-			zip = new ZipFile("ExtractDir" + File.separator +file);
+
+		try(ZipFile zip = new ZipFile("ExtractDir" + File.separator +file)) {
 		    String newPath =  zipFile.substring(0, zipFile.length() - 4);
 		    new File(newPath).mkdir();
 		    Enumeration zipFileEntries = zip.entries();
@@ -225,14 +224,6 @@ public class CreateNewMicroServiceModel {
 		    }
 	    } catch (IOException e) {
 			logger.error("Failed to unzip model file " + zipFile + e);
-		}finally{
-			if(zip != null){
-				try {
-					zip.close();
-				} catch (Exception e) {
-					logger.error("Exception Occured while closing the zip file"+e);
-				}
-			}
 		}
 	}
 
diff --git a/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/PolicyDBDao.java b/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/PolicyDBDao.java
index a8449e307..60b35fb09 100644
--- a/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/PolicyDBDao.java
+++ b/ONAP-PAP-REST/src/main/java/org/onap/policy/pap/xacml/rest/components/PolicyDBDao.java
@@ -1923,18 +1923,15 @@ public class PolicyDBDao {
 		
 		private String readConfigFile(String configPath){
 			String configDataString = null;
-			InputStream configContentStream = null;
-			try {
-				configContentStream = new FileInputStream(configPath);
+
+			try(InputStream configContentStream = new FileInputStream(configPath)) {
 				configDataString = IOUtils.toString(configContentStream);
 			} catch (FileNotFoundException e) {
 				logger.error("Caught FileNotFoundException on new FileInputStream("+configPath+")",e);
 				throw new IllegalArgumentException("The config file path does not exist");
 			} catch(IOException e2){
-				logger.error("Caught IOException on newIOUtils.toString("+configContentStream+")",e2);
+				logger.error("Caught IOException on newIOUtils.toString(configContentStream)",e2);
 				throw new IllegalArgumentException("The config file path cannot be read");
-			} finally {
-				IOUtils.closeQuietly(configContentStream);
 			}
 			if(configDataString == null){
 				throw new IllegalArgumentException("The config file path cannot be read");
diff --git a/ONAP-PDP-REST/src/main/java/org/onap/policy/pdp/rest/api/services/PDPServices.java b/ONAP-PDP-REST/src/main/java/org/onap/policy/pdp/rest/api/services/PDPServices.java
index af7112ebd..8722de4fe 100644
--- a/ONAP-PDP-REST/src/main/java/org/onap/policy/pdp/rest/api/services/PDPServices.java
+++ b/ONAP-PDP-REST/src/main/java/org/onap/policy/pdp/rest/api/services/PDPServices.java
@@ -340,10 +340,9 @@ public class PDPServices {
         if(pdpConfigLocation.contains("/")){
             pdpConfigLocation = pdpConfigLocation.replace("/", File.separator);
         }
-        InputStream inputStream = null;
+
         JsonReader jsonReader = null;
-        try {
-            inputStream = new FileInputStream(new File(pdpConfigLocation));
+        try(InputStream inputStream = new FileInputStream(new File(pdpConfigLocation))) {
             try {
                 if (pdpConfigLocation.endsWith("json")) {
                     pdpResponse.setType(PolicyType.JSON);
@@ -413,10 +412,6 @@ public class PDPServices {
         } catch (FileNotFoundException e) {
             LOGGER.error(XACMLErrorConstants.ERROR_DATA_ISSUE + e);
             throw new PDPException(XACMLErrorConstants.ERROR_DATA_ISSUE + "Error in ConfigURL", e);
-        }finally{
-        	if(inputStream != null){
-            	inputStream.close();
-        	}
         }
     }
 
diff --git a/POLICY-SDK-APP/src/main/java/org/onap/policy/admin/PolicyRestController.java b/POLICY-SDK-APP/src/main/java/org/onap/policy/admin/PolicyRestController.java
index 8df9d1b89..21f15bb8a 100644
--- a/POLICY-SDK-APP/src/main/java/org/onap/policy/admin/PolicyRestController.java
+++ b/POLICY-SDK-APP/src/main/java/org/onap/policy/admin/PolicyRestController.java
@@ -338,10 +338,17 @@ public class PolicyRestController extends RestrictedBaseController{
 				// get the response content into a String
 				String responseJson = null;
 				// read the inputStream into a buffer (trick found online scans entire input looking for end-of-file)
-				java.util.Scanner scanner = new java.util.Scanner(connection.getInputStream());
-				scanner.useDelimiter("\\A");
-				responseJson =  scanner.hasNext() ? scanner.next() : "";
-				scanner.close();
+				try(java.util.Scanner scanner = new java.util.Scanner(connection.getInputStream())) {
+					scanner.useDelimiter("\\A");
+					responseJson = scanner.hasNext() ? scanner.next() : "";
+				} catch (Exception e) {
+					//Reason for rethrowing the exception is if any exception occurs during reading of inputsteam
+					//then the exception handling is done by the outer block without returning the response immediately
+					//Also finally block is existing only in outer block and not here so all exception handling is
+					//done in only one place
+					policyLogger.error("Exception Occured"+e);
+					throw e;
+				}
 				policyLogger.info("JSON response from PAP: " + responseJson);
 				return responseJson;
 			}
diff --git a/POLICY-SDK-APP/src/main/java/org/onap/policy/admin/RESTfulPAPEngine.java b/POLICY-SDK-APP/src/main/java/org/onap/policy/admin/RESTfulPAPEngine.java
index a8831eaaf..b14a8815e 100644
--- a/POLICY-SDK-APP/src/main/java/org/onap/policy/admin/RESTfulPAPEngine.java
+++ b/POLICY-SDK-APP/src/main/java/org/onap/policy/admin/RESTfulPAPEngine.java
@@ -455,10 +455,13 @@ public class RESTfulPAPEngine extends StdPDPItemSetChangeNotifier implements PAP
 	            	// get the response content into a String
 	            	String json = null;
 	    			// read the inputStream into a buffer (trick found online scans entire input looking for end-of-file)
-	    		    java.util.Scanner scanner = new java.util.Scanner(connection.getInputStream());
-	    		    scanner.useDelimiter("\\A");
-	    		    json =  scanner.hasNext() ? scanner.next() : "";
-	    		    scanner.close();
+	    		    try(java.util.Scanner scanner = new java.util.Scanner(connection.getInputStream())) {
+						scanner.useDelimiter("\\A");
+						json = scanner.hasNext() ? scanner.next() : "";
+					}catch(Exception e) {
+						LOGGER.error(XACMLErrorConstants.ERROR_PROCESS_FLOW + "Failed to read inputStream from connection: " + e, e);
+	    		    	throw e;
+					}
 	    		    LOGGER.info("JSON response from PAP: " + json);
 	            	
 	            	// convert Object sent as JSON into local object