Project Jigsaw, planned for Java 9, addresses several long-standing Java pain points: JAR/classpath hell caused by fragile class loading, weak encapsulation across package boundaries, manual security enforcement via SecurityManager, slow startup from full classpath scans, and a rigid monolithic JRE. To solve these, Jigsaw introduces a module system with explicit dependency declarations enabling reliable configuration, strong encapsulation of internal APIs, improved security and maintainability, better optimization opportunities for performance, and a scalable platform allowing custom JRE subsets tailored to specific application needs.
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