What is the purpose of declaring a class as Java-Bean in MANIFEST.MF file?












0















When I open MANIFEST.MF file of rt.jar, I can find classes from swing package are declared as java beans. What is the difference between these classes and normal java classes?



MANIFEST.MF file: 



Manifest-Version: 1.0

Implementation-Vendor: Oracle Corporation

Implementation-Title: Java Runtime Environment

Implementation-Version: 1.8.0_191

Specification-Vendor: Oracle Corporation

Created-By: 1.7.0_07 (Oracle Corporation)

Specification-Title: Java Platform API Specification

Specification-Version: 1.8



Name: javax/swing/JCheckBoxMenuItem.class

Java-Bean: True



Name: javax/swing/JDialog.class

Java-Bean: True



Name: javax/swing/JSlider.class

Java-Bean: True



Name: javax/swing/JTextField.class

Java-Bean: True



Name: javax/swing/JTextPane.class

Java-Bean: True



Name: javax/swing/JTextArea.class

Java-Bean: True



Name: javax/swing/JList.class

Java-Bean: True



Name: javax/swing/JFormattedTextField.class

Java-Bean: True





java javabeans meta-inf rt.jar







share|improve this question

























  • It’s part of the JavaBeans specification. Considering how old that specification is, it probably was intended to facilitate faster loading of classes. In the 90s, reading a jar file was a noticeably slow operation.

    – VGR
    Nov 24 '18 at 16:45
















0















When I open MANIFEST.MF file of rt.jar, I can find classes from swing package are declared as java beans. What is the difference between these classes and normal java classes?



MANIFEST.MF file: 



Manifest-Version: 1.0

Implementation-Vendor: Oracle Corporation

Implementation-Title: Java Runtime Environment

Implementation-Version: 1.8.0_191

Specification-Vendor: Oracle Corporation

Created-By: 1.7.0_07 (Oracle Corporation)

Specification-Title: Java Platform API Specification

Specification-Version: 1.8



Name: javax/swing/JCheckBoxMenuItem.class

Java-Bean: True



Name: javax/swing/JDialog.class

Java-Bean: True



Name: javax/swing/JSlider.class

Java-Bean: True



Name: javax/swing/JTextField.class

Java-Bean: True



Name: javax/swing/JTextPane.class

Java-Bean: True



Name: javax/swing/JTextArea.class

Java-Bean: True



Name: javax/swing/JList.class

Java-Bean: True



Name: javax/swing/JFormattedTextField.class

Java-Bean: True





java javabeans meta-inf rt.jar







share|improve this question

























  • It’s part of the JavaBeans specification. Considering how old that specification is, it probably was intended to facilitate faster loading of classes. In the 90s, reading a jar file was a noticeably slow operation.

    – VGR
    Nov 24 '18 at 16:45














0












0








0








When I open MANIFEST.MF file of rt.jar, I can find classes from swing package are declared as java beans. What is the difference between these classes and normal java classes?



MANIFEST.MF file: 



Manifest-Version: 1.0

Implementation-Vendor: Oracle Corporation

Implementation-Title: Java Runtime Environment

Implementation-Version: 1.8.0_191

Specification-Vendor: Oracle Corporation

Created-By: 1.7.0_07 (Oracle Corporation)

Specification-Title: Java Platform API Specification

Specification-Version: 1.8



Name: javax/swing/JCheckBoxMenuItem.class

Java-Bean: True



Name: javax/swing/JDialog.class

Java-Bean: True



Name: javax/swing/JSlider.class

Java-Bean: True



Name: javax/swing/JTextField.class

Java-Bean: True



Name: javax/swing/JTextPane.class

Java-Bean: True



Name: javax/swing/JTextArea.class

Java-Bean: True



Name: javax/swing/JList.class

Java-Bean: True



Name: javax/swing/JFormattedTextField.class

Java-Bean: True





java javabeans meta-inf rt.jar







share|improve this question
















When I open MANIFEST.MF file of rt.jar, I can find classes from swing package are declared as java beans. What is the difference between these classes and normal java classes?



MANIFEST.MF file: 



Manifest-Version: 1.0

Implementation-Vendor: Oracle Corporation

Implementation-Title: Java Runtime Environment

Implementation-Version: 1.8.0_191

Specification-Vendor: Oracle Corporation

Created-By: 1.7.0_07 (Oracle Corporation)

Specification-Title: Java Platform API Specification

Specification-Version: 1.8



Name: javax/swing/JCheckBoxMenuItem.class

Java-Bean: True



Name: javax/swing/JDialog.class

Java-Bean: True



Name: javax/swing/JSlider.class

Java-Bean: True



Name: javax/swing/JTextField.class

Java-Bean: True



Name: javax/swing/JTextPane.class

Java-Bean: True



Name: javax/swing/JTextArea.class

Java-Bean: True



Name: javax/swing/JList.class

Java-Bean: True



Name: javax/swing/JFormattedTextField.class

Java-Bean: True





java javabeans meta-inf rt.jar




java javabeans meta-inf rt.jar






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 24 '18 at 15:21









Gayan Mettananda

1,112713




1,112713










asked Nov 24 '18 at 15:11









Anoop DeshpandeAnoop Deshpande

295




295













  • It’s part of the JavaBeans specification. Considering how old that specification is, it probably was intended to facilitate faster loading of classes. In the 90s, reading a jar file was a noticeably slow operation.

    – VGR
    Nov 24 '18 at 16:45



















  • It’s part of the JavaBeans specification. Considering how old that specification is, it probably was intended to facilitate faster loading of classes. In the 90s, reading a jar file was a noticeably slow operation.

    – VGR
    Nov 24 '18 at 16:45

















It’s part of the JavaBeans specification. Considering how old that specification is, it probably was intended to facilitate faster loading of classes. In the 90s, reading a jar file was a noticeably slow operation.

– VGR
Nov 24 '18 at 16:45





It’s part of the JavaBeans specification. Considering how old that specification is, it probably was intended to facilitate faster loading of classes. In the 90s, reading a jar file was a noticeably slow operation.

– VGR
Nov 24 '18 at 16:45












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