7.1

New features

• Added "Find Subclasses" on class nodes (#85)

• Added "Find Implementing Classes" on interface nodes (#85)

• Added "Find Annotated Elements" on annotation classes, plus a general
  "Search" action on the general info pane and on interface nodes (#85)

• Class file scanning for "Find usages" is significantly faster. UTF-8
  constant pool entries are now decoded lazily, and attribute skipping can
  be enabled per read via the new ClassFileReadMode on DataInput
  (previously only controllable through a global system property)
• Classpath tree scanning is noticeably faster on large class hierarchies
• The Windows installer has been streamlined: additional locales, a
  persistent language selection, and a simpler installation flow
• Support for reading Java 26 class files

Bug fixes

• Obfuscated JARs where class entries are disguised as directories can now
  be opened (#75)
• addConstantPoolEntry did not add placeholder slots for long and
  double constants (#79)
• Hash codes of constant pool entries did not depend on the constant type
• The class file version constant for Java 26 was incorrect
• Dragging the same JAR file onto the browser a second time left the class
  file browser empty

7.0

New features

• jclasslib now has a modern look with new icons and a new logo

• Added "Find usages" buttons to all constant pool entries

• Added "Find usages" buttons to all field and method entries

• Added a filter text field to the classpath chooser dialog.

• The filter text field on the constant pool and class member detail pane was modernized and now includes a match mode drop-down.
• Added locales for Japanese and Korean
• Support for reading and writing Java 25 classes

Bug fixes

• "Show method" and "Show field" actions did not work if the method was implemented in a superclass of the referenced class
• When opening a class file via the file association while jclasslib was not open, two windows were opened, with the empty window on top
• Link colors in multi-line labels were not updated when light/dark mode was changed

6.1

New features

• The data module is now a Kotlin Multiiplatform library. Java class parameters in signatures have been changed to Kotlin class parameters.
• Support reading class files compiled by Java 23

6.0.5

New features

• Support reading class files compiled by Java 21 and Java 22
• When saving modified class files, ask whether to overwrite the original class files or to save to a different output directory with the option to remember the selection

6.0.4

New features

• Show JVM spec for opcodes in Javadoc for Java 19
• Support reading class files compiled by Java 19 and Java 20

Bug fixes

• Fixed "class root not found" message in IntelliJ IDEA plugin

6.0.3

New features

• Improved display of record attributes by displaying each record entry as a single node with nested attribute nodes
• Support reading class files compiled by Java 18
• Added a placeholder panel with instructions in the IDEA tool window

Bug fixes

• Menu items with and without icons were not aligned on macOS
• PermittedSubclassesAttribute and RecordAttribute were saved incorrectly and corrupted the class file
• For Java 9+, the tree of JRE classes always showed the classes of the currently used JRE

6.0.1

Bug fixes

Updated translations with new messages in 6.0

6.0

New features

• Editing functionality for constant pool, attributes and bytecode

You can edit constant pool entries:

Attribute values, like access flags:

Bytecode instructions can be edited from the context menu:

The opcode itself can be replaced with another compatible opcode:

The immediate values of instructions can be edited:

• Attach mode: Connect to any locally running JVM and view and edit its loaded classes

• By setting -Djclasslib.locale=en (or another supported locale), the displayed language can be changed regardless of the default locale. In this way, the language can be overridden in the IDEA plugin
• Links to JVM spec now show the document for Java 16 instead of Java 8

Bug fixes

• Explicit language selection was broken in 5.8
• UI fixes and improvements
• Fixed error when writing the NestMembers attribute

5.8

New features

• Runs natively on macOS ARM (Apple Silicon)
• Linux x64 archive with a bundled JetBrains Runtime that works with fractional HiDPI
• Polish translation
• Automatic detection of dark mode
• Support for reading class files up to Java 17

5.7

New features

• Value labels and hyperlinks can be focused and text in value labels can be selected
• Support the Record class file attribute new in Java 14
• Support the PermittedSubclasses class file attribute new in Java 15

Bug fixes

• Installer was not localized in Simplified Chinese
• Checkbox and radio button menu items did not have the correct icon in the selected state