#Java - Code Snippets for '#Exceptions' - 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 |
|
|
|
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 |
|
|