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Maven error: Could not find or load main class org.codehaus.plexus.classworlds.launcher.Launcher
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Worked with Maven 3.3.3 binary, on Ubuntu. JAVA_HOME is not set.
– TFuto
Jun 2 '15 at 14:07
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Type safety: Unchecked cast
...re would not be a warning in the first case, I'm not sure how pedantic the Java compiler is with warnings for Java 5). However, you are converting it to a HashMap<String, String>.
HashMaps are really maps that take an object as a key and have an object as a value, HashMap<Object, Object>...
RabbitMQ and relationship between channel and connection
The RabbitMQ Java client has the following concepts:
4 Answers
4
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Scripting Language vs Programming Language [closed]
...before you can run it. But in the normal case, you don't have to compile a JavaScript program before you run it. So JavaScript is sometimes called a "scripting" language.
This line is getting more and more blurry since compilation can be so fast with modern hardware and modern compilation technique...
Java 8 stream reverse order
... one of our company's internal utility classes, which we use to supplement java.util.stream.Stream's static methods.
– Brandon
Jan 6 '16 at 20:54
3
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How do you see recent SVN log entries?
...-04-02 15:31:31 +0200 (Mon, 02 Apr 2012) | 1 line Changed
paths:
A /trunk/java/App/src/database/support
A /trunk/java/App/src/database/support/MIGRATE
A /trunk/java/App/src/database/support/MIGRATE/remove_device.sql
D /trunk/java/App/src/code/test.xml
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What is the difference between == and equals() in Java?
...ich states that equal objects must have equal hash codes. (docs.oracle.com/javase/7/docs/api/java/lang/…)
– Abhijeet
Jul 6 '16 at 13:20
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How to convert a String into an ArrayList?
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In Java 9, using List#of, which is an Immutable List Static Factory Methods, become more simpler.
String s = "a,b,c,d,e,.........";
List<String> lst = List.of(s.split(","));
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java.sql.SQLException: Incorrect string value: '\xF0\x9F\x91\xBD\xF0\x9F…'
...re not in the basic multilingual plane. They cannot be even represented in java as one char, "????????".length() == 4. They are definitely not null characters and one will see squares if you are not using fonts that support them.
MySQL's utf8 only supports basic multilingual plane, and you need to ...
LinkedBlockingQueue vs ConcurrentLinkedQueue
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This question deserves a better answer.
Java's ConcurrentLinkedQueue is based on the famous algorithm by Maged M. Michael and Michael L. Scott for non-blocking lock-free queues.
"Non-blocking" as a term here for a contended resource (our queue) means that regardle...