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#Java - Code Snippets for '#Exception' - 8 code snippet(s) found

 Sample 1. Exception handling and logging using Log4j

private static final Logger LOGGER = Logger.getLogger(BuggyBread.class);

public static void main(String[] args) {
   try {
      // Do Something   
   } catch (Throwable t) {
      LOGGER.error("Shit Happens");
   } finally {
      // release the connections
   }
}



   Like      Feedback     exception handling  exceptions  log4j  logging  logger  finally


 Sample 2. Blogger API for creating Posts ( Change xxxxxx to your blog specific info )

package Reader;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;

import com.squareup.okhttp.MediaType;
import com.squareup.okhttp.OkHttpClient;

public class BlogPostCreater {

public static final MediaType JSON = MediaType.parse("application/json; charset=utf-8");

OkHttpClient client = new OkHttpClient();

String post(String title, String content,String label,String authorization_key) throws IOException {

content = content.replace(""",""");


String url = "https://www.googleapis.com/blogger/v3/blogs/xxxxxxxxxx/posts?clientId=xxxxxxxx&clientSecret=xxxxxxxx";

HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(url);

// add header
post.setHeader("Authorization", authorization_key);
post.setHeader("Content-type","application/json");

post.setEntity(new StringEntity(buildJson(title,content,label)));

HttpResponse response = client.execute(post);

System.out.println(response);

return "true";
}



String buildJson(String title, String content,String label) {

System.out.println(label);
return "{"status": "LIVE", "content": ""+content+"", "kind": "blogger#post"" +
", "title": ""+title+"", "url": "xxxxxx", " +
""readerComments": "DONT_ALLOW_HIDE_EXISTING", "author": {" +
""url": "https://www.blogger.com/profile/04326686331881561093", " +
""image": {" +
""url": "//lh4.googleusercontent.com/-64Ucx9lX9Q4/AAAAAAAAAAI/AAAAAAAAAx0/-rUjBgS3djE/s35-c/photo.jpg"" +
"}, " +
""displayName": "Vivek Vermani", " +
""id": "g108356395081185480077"" +
"}, "updated": "2015-09-28T09:46:12+05:30", "replies": {"totalItems": "0", " +
""selfLink": "https://www.googleapis.com/blogger/v3/blogs/xxxxxxxxxx/posts/2495464003469367152/comments"" +
"}, "blog": {"id": "4275342475651800664"}, " +
""etag": "'GtyIIQmNmmUjEA0nwhSqMElCJ1g/dGltZXN0YW1wOiAxNDQzNDEzNzcyMDc1Cm9mZnNldDogMTk4MDAwMDAK'", " +
""published": "2015-09-28T09:46:00+05:30", " +
""id": "2495464003469367152", " +
""selfLink": "https://www.googleapis.com/blogger/v3/blogs/xxxxxx/posts/2495464003469367152"}";
}

public String post(String url, Map<String,String> formParameters) throws ClientProtocolException, IOException {
HttpPost request = new HttpPost(url);

List <NameValuePair> nvps = new ArrayList <NameValuePair>();

for (String key : formParameters.keySet()) {
nvps.add(new BasicNameValuePair(key, formParameters.get(key)));
}

request.setEntity(new UrlEncodedFormEntity(nvps));

return execute(request);
}

// makes request and checks response code for 200
private String execute(HttpRequestBase request) throws ClientProtocolException, IOException {
HttpClient httpClient = new DefaultHttpClient();
HttpResponse response = httpClient.execute(request);

HttpEntity entity = response.getEntity();
String body = EntityUtils.toString(entity);

if (response.getStatusLine().getStatusCode() != 200) {
throw new RuntimeException("Expected 200 but got " + response.getStatusLine().getStatusCode() + ", with body " + body);
}

return body;
}


}

   Like      Feedback     blogger api   blogger api for post creation  java.lang.RuntimeException


 Sample 3. Retry in case of exception

public static final int NUMBER_OF_RETRIES = 5;

try {
   // do something
} catch (Exception e) {
   int count;
   for (count = 1; count <= NUMBER_OF_RETRIES; count++) {
      Thread.sleep(5000);
   } catch (InterruptedException e1) {
      try {
         // do something again
         break;
      } catch (Exception ex) {
   }
}

   Like      Feedback     exception handling   exception   Retry in case of exception   for loop   for   Thread.sleep   InterruptedException


 Sample 4. Internal Implementation of MinguoEra

public enum MinguoEra implements Era {
BEFORE_ROC,
ROC;

public static MinguoEra of(int minguoEra) {
switch (minguoEra) {
case 0:
return BEFORE_ROC;
case 1:
return ROC;
default:
throw new DateTimeException("Invalid era: " + minguoEra);
}
}

@Override
public int getValue() {
return ordinal();
}

}

   Like      Feedback     MinguoEra  java.time  java.time.chrono  internal implementation  enum  switch  throw  exception throw


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 Sample 5. getting file path, absolute path and canonical path

public static void main(String[] args){
String parent = null;
File file = new File("/file.txt");
System.out.println(file.getPath());
System.out.println(file.getAbsolutePath());
try {
System.out.println(file.getCanonicalPath());
} catch (IOException e) {
e.printStackTrace();
}
}

   Like      Feedback     file  absolute path  canonical path  canonical  file handling  java.io.IOException


 Sample 6. Internal Implementation of ArrayList#removeIf

@Override
public boolean removeIf(Predicate<? super E> filter) {
Objects.requireNonNull(filter);

int removeCount = 0;
final BitSet removeSet = new BitSet(size);
final int expectedModCount = modCount;
final int size = this.size;
for (int i=0; modCount == expectedModCount && i < size; i++) {
@SuppressWarnings("unchecked")
final E element = (E) elementData[i];
if (filter.test(element)) {
removeSet.set(i);
removeCount++;
}
}
if (modCount != expectedModCount) {
throw new ConcurrentModificationException();
}

// shift surviving elements left over the spaces left by removed elements
final boolean anyToRemove = removeCount > 0;
if (anyToRemove) {
final int newSize = size - removeCount;
for (int i=0, j=0; (i < size) && (j < newSize); i++, j++) {
i = removeSet.nextClearBit(i);
elementData[j] = elementData[i];
}
for (int k=newSize; k < size; k++) {
elementData[k] = null; // Let gc do its work
}
this.size = newSize;
if (modCount != expectedModCount) {
throw new ConcurrentModificationException();
}
modCount++;
}

return anyToRemove;
}

   Like      Feedback     Internal Implementation of ArrayList#removeIf  java.util.function.Predicate  java.util.Objects  java.util.Objects  java.util.ConcurrentModificationException.ConcurrentModificationException


 Sample 7. Code Sample / Example / Snippet of org.apache.hadoop.hdfs.protocol.UnregisteredDatanodeException

  public DatanodeDescriptor getDatanode(DatanodeID nodeID) throws IOException {

UnregisteredDatanodeException e = null;

DatanodeDescriptor node = datanodeMap.get(nodeID.getStorageID());

if (node == null)

return null;

if (!node.getName().equals(nodeID.getName())) {

e = new UnregisteredDatanodeException(nodeID, node);

NameNode.stateChangeLog.fatal("BLOCK* NameSystem.getDatanode: "

+ e.getLocalizedMessage());

throw e;

}

return node;

}




   Like      Feedback      org.apache.hadoop.hdfs.protocol.UnregisteredDatanodeException


 Sample 8. Printing Stack trace using Apache Commons ExceptionUtils

try {

} catch (Exception ex){
   System.out.println(ExceptionUtils.getFullStackTrace(ex));
}

   Like      Feedback     Apache Commons ExceptionUtils  Apache commons



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