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How to set up Spark on Windows?
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Steps to install Spark in local mode:
Install Java 7 or later.
To test java installation is complete, open command prompt type java and hit enter.
If you receive a message 'Java' is not recognized as an internal or external command. You need to configure your environmen...
Downcasting in Java
Upcasting is allowed in Java, however downcasting gives a compile error.
11 Answers
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How can I find and run the keytool
...und a solution by myself as below quote. It works fine.
"C:\Program Files\Java\jdk1.6.0_26\bin\keytool.exe" -exportcert -alias
> sociallisting -keystore "D:\keystore\SocialListing" |
> "C:\cygwin\bin\openssl.exe" sha1 -binary | "C:\cygwin\bin\openssl.exe"
> base64
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How to parse/format dates with LocalDateTime? (Java 8)
Java 8 added a new java.time API for working with dates and times ( JSR 310 ).
7 Answers
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When is an interface with a default method initialized?
While searching through the Java Language Specification to answer this question , I learned that
4 Answers
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How can I make a multipart/form-data POST request using Java?
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These are the Maven dependencies I have.
Java Code:
HttpClient httpclient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
FileBody uploadFilePart = new FileBody(uploadFile);
MultipartEntity reqEntity = new MultipartEntity();
reqEntity.addPart("up...
How should I copy Strings in Java?
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Set time to 00:00:00
I have a problem resetting hours in Java. For a given date I want to set the hours to 00:00:00.
12 Answers
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Force Java timezone as GMT/UTC
... single instance of a running JVM, set the user.timezone system property:
java -Duser.timezone=GMT ... <main-class>
If you need to set specific time zones when retrieving Date/Time/Timestamp objects from a database ResultSet, use the second form of the getXXX methods that takes a Calendar o...
JPQL IN clause: Java-Arrays (or Lists, Sets…)?
...', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f2772305%2fjpql-in-clause-java-arrays-or-lists-sets%23new-answer', 'question_page');
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