InfoWorld

Checking for Null or Empty or White Space Only String in Java

.NET Framework 4 introduces a new method on its String class called IsNullOrWhiteSpace that checks whether a provided String is null, empty, or consists only of “white space.” This handy method is in ...
GitHub

java.lang.NullPointerException: Cannot invoke "org.xmpp.forms.DataForm.getField(String)"

Found after restarting Openfire with 5.0.0-SNAPSHOT and a newish build of the Monitoring plugin. This appears to be caused by a search query (for a MUC archive) that doesn't specify any search ...
GitHub

bug: java.lang.StringIndexOutOfBoundsException: Range [0, -1852) out of bounds for length 0

VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o. java.lang.StringIndexOutOfBoundsException: Range [0, -1852) out of bounds for length 0 at java.base/jdk.internal.util ...
InfoWorld

How to describe Java code with annotations

Learn how to use Java annotations to associate metadata with classes, methods, and other application elements in your Java programs. There are times when you need to associate metadata, or data that ...