2022-05-20 04:22
Race condition is one of the most common problem in multi-threaded applications. Race condition occur when two or more threads try to perform some operation on a Shared variable at a… Read More
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Tutorial on Java, Design Patterns, collections, Struts, jdbc
2022-05-20 04:09
--delete-target-dir option overwrite the content of target directory. Let me explain it with an example.sqoop import \--connect "jdbc:mysql://quickstart.cloudera:3306/retail_db" \--us… Read More
2022-05-19 04:30
Syntax{SQOOP_COMMAND} &> {LOG_FILE_NAME} Example sqoop-list-databases --connect "jdbc:mysql://quickstart.cloudera:3306" --username "root" --password "cloudera" &a&hell…Read More
2022-05-18 11:53
In this post, I am going to explain how to remove special characters from a string. Approach 1: Using Character.isAlphabetic or Character.isDigit method. ExampleStringBuilder b… Read More
2022-05-18 11:34
Java provide both float and double data types to represent real numbers. But you should know the key differences when you are working with float and double types in your application. … Read More
2022-05-18 10:12
'Error: Could not find or load main class HelloWorld' error occur when you try to run the main class HelloWorld, but Java runtime unable to find it. Let’s try to produce the err… Read More
2022-05-18 09:03
Yes, you can run a class file that is compiled in lower environment. For example, Let me compile a class in JDK1.7 and try to run in JDK1.8. HelloWorld.javapublic class HelloWo… Read More
2022-05-18 08:57
Every Java release internally maintains a major and minor version numbers. Below table summarizes different major.minor versions of Jdk. JDK version Major version nu… Read More
2022-05-18 08:50
UnsupportedClassVersionError is thrown when the Java Virtual Machine attempts to read a class file and determines that the major and minor version numbers in the file are not supported. &hell…Read More
2022-05-18 08:43
In general, --auto-reset-to-one-mapper option and -num-mappers are used together.--autoreset-to-one-mapper \--num-mappers 3 Above snippet specifies, if a table has primary key, then use… Read More
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