Math.abs()

Math.abs(-9223372036854775808L) == -9223372036854775808L = Long.MIN_VALUE

Comments

Post a Comment

Popular posts from this blog

Java Encryption/Decryption

Java does not always throw exception while decoding a text using different key than the one used for encoding it. Though the decoded text will be garbage. So dont rely on throwing exception if the key is incorrect. Character.getType(character) returns a in value which stands for a category to which character belongs. esp. the value returned as 28 stands for OTHER_SYMBOLS and it is normally non-printable junk characters.
Read more

Transactions in HIVE

Full ACID  semantics at row level is supported since HIVE  0.13.  Earlier it was only supported at partition level.   Atomicity: Entire operation is single operation. Either entire operation happens or none. Consistency: Once an operation is completed, every subsequent operations sees the same result of it.  Isolation: One user operation does not impact another user.  Durability: Once operation is done ..its result remains thereafter. At present isolation is only at snapshot level. There are following isolation levels in various DBMS: Snapshot: The snapshot of data at the beginning of  transaction will be visible to through out the transaction. Whatever is happening in other transaction will never be seen by this transaction.  Dirty Read: Uncommitted updates from other transactions can be seen. Read Committed: Only updates which are committed at the time of read will be seen by this transaction. Repeatable Read: Read lock on data being read a...
Read more

Azure App Services

Spring REST API App Deployment in Azure App Services  Within Azure App Services , Spring REST API application is deployed slightly different than a simple J2EE web application. A Sprint REST application can simply run inside JRE and don't need a container like tomcat. If you are planning to use azure-webapp-maven-plugin , it will need to be configured slightly differently. For a Spring REST API  application  , the plugin  configuration will look like following.     <plugin>         <groupId>com.microsoft.azure</groupId>         <artifactId>azure-webapp-maven-plugin</artifactId>         <version>1.7.0</version>         <configuration>             <!-- Specify v2 schema -->             <schemaVersion>v2</schemaVersion> ...
Read more