The SecurityException in Java is a runtime exception triggered by the security manager to indicate a security breach, typically when there is a conflict with package names between an application and signed JAR files on the classpath. This unchecked exception, which does not require declaration in a method or constructor's throws clause, can cause application execution to halt. A typical scenario involves overlapping package names between application code and classes in a signed JAR, leading the JVM to throw a SecurityException due to mismatched signer information. To address such issues, developers should ensure package names do not conflict with signed JARs, and all JAR files must be signed with the same certificate, or manifest signatures should be removed. Additionally, applications running under a security manager must have appropriate permissions for accessing system resources to prevent SecurityExceptions. Tools like Rollbar can aid in tracking, analyzing, and managing Java errors and exceptions, enhancing confidence in code deployment by automating error monitoring and triaging.