OS:
Windows
Linux

Environments:
Operating System: Windows 2025 x64
Language: English (Regional Setting: English)
Processor: 11th Gen Intel(R) Core (TM) i5-1135G7 @ 2.40GHz 2.42GHz (2 processors)
OS type: 64-bit
Memory: 4 GB
LAF: manual-laf-Nimbus-Dark

Operating System: Ubuntu Linux 25.04 x64
Language: English (Regional Setting: English)
Processor: Intel® Xeon® Silver 4210 × 8
Graphics: Software Rendering
OS type: 64-bit
GNOME version: 48
Memory: 8GB
LAF: manual-laf-Nimbus-Dark, manual-laf-Nimbus-Light


Reproducible: Always

Failed on Release/Build: JDK_25_b26
Is it a Regression in JDK 25 release: N/A
[If Regression] Regression introduced in JDK 25 release/build: N/A
Test result on the last GAed release for this train: N/A
Is it a platform-specific issue: No. This issue happens on Windows and Linux.

General description of the problem:
Test 'javax/swing/JTabbedPane/bug4499556.java' failed because after selecting one of L&F items, the test case automatically failed when clicking on L&F Menu button again

Affected test:
javax/swing/JTabbedPane/bug4499556.java

Steps to reproduce:
     1. Run command:
#!/bin/sh -x

jtreg \
-verbose:summary \
-k:!printer \
-m \
-gui \
-conc:1 \
-vmoption:-Dswing.defaultlaf=javax.swing.plaf.nimbus.NimbusLookAndFeel \
-nativepath:C:/Users/user/Desktop/Reg/jdk-25-ea+26_windows-x64_bin-tests/jdk/jtreg/native \
-exclude:C:/Users/user/Desktop/Reg/open/test/jdk/ProblemList.txt \
-exclude:C:/Users/user/Desktop/Reg/closed/test/jdk/ProblemList.txt \
-testjdk:C:/Users/user/Desktop/Reg/jdk-25 \
-dir:C:/Users/user/Desktop/Reg/open/test/jdk \
-reportDir:results/JTreport \
-workDir:results/JTwork \
C:/Users/user/Desktop/Reg/open/test/jdk/:jdk_swing

     2. Run the test case: javax/swing/JTabbedPane/bug4499556.java
     3. Select one of L&F items
     4. Click on L&F Menu button again
     

Expected behavior:
The test case is displayed normally to test when clicking on L&F Menu button again

Actual behavior:
The test case automatically failed when clicking on L&F Menu button again

Any non-default VM flags:
'C:\\Users\\user\\Desktop\\Reg\\jdk-25\\bin\\java' \\
        -Dtest.vm.opts=-Dswing.defaultlaf=javax.swing.plaf.nimbus.NimbusLookAndFeel \\
        -Dtest.tool.vm.opts=-J-Dswing.defaultlaf=javax.swing.plaf.nimbus.NimbusLookAndFeel \\
        -Dtest.compiler.opts= \\
        -Dtest.java.opts= \\
        -Dtest.jdk='C:\\Users\\user\\Desktop\\Reg\\jdk-25' \\
        -Dcompile.jdk='C:\\Users\\user\\Desktop\\Reg\\jdk-25' \\
        -Dtest.timeout.factor=1.0 \\
        -Dtest.nativepath='C:\\Users\\user\\Desktop\\Reg\\jdk-25-ea+26_windows-x64_bin-tests\\jdk\\jtreg\\native' \\
        -Dtest.root='C:\\Users\\user\\Desktop\\Reg\\open\\test\\jdk' \\
        -Dtest.name=javax/swing/JTabbedPane/bug4499556.java \\
        -Dtest.verbose=Verbose[p=DEFAULT,f=DEFAULT,e=DEFAULT,t=false,m=false] \\
        -Dtest.file='C:\\Users\\user\\Desktop\\Reg\\open\\test\\jdk\\javax\\swing\\JTabbedPane\\bug4499556.java' \\
        -Dtest.main.class=bug4499556 \\
        -Dtest.src='C:\\Users\\user\\Desktop\\Reg\\open\\test\\jdk\\javax\\swing\\JTabbedPane' \\
        -Dtest.src.path='C:\\Users\\user\\Desktop\\Reg\\open\\test\\jdk\\javax\\swing\\JTabbedPane;C:\\Users\\user\\Desktop\\Reg\\open\\test\\jdk\\java\\awt\\regtesthelpers' \\
        -Dtest.classes='C:\\Users\\user\\Desktop\\Reg\\results\\JTwork\\classes\\javax\\swing\\JTabbedPane\\bug4499556.d' \\
        -Dtest.class.path='C:\\Users\\user\\Desktop\\Reg\\results\\JTwork\\classes\\javax\\swing\\JTabbedPane\\bug4499556.d;C:\\Users\\user\\Desktop\\Reg\\results\\JTwork\\classes\\java\\awt\\regtesthelpers' \\
        -Dtest.modules=java.desktop \\
        --add-modules java.desktop \\
        -Dswing.defaultlaf=javax.swing.plaf.nimbus.NimbusLookAndFeel \\
        '-Djava.library.path=C:\\Users\\user\\Desktop\\Reg\\jdk-25-ea+26_windows-x64_bin-tests\\jdk\\jtreg\\native' \\
        com.sun.javatest.regtest.agent.MainWrapper 'C:\\Users\\user\\Desktop\\Reg\\results\\JTwork\\javax\\swing\\JTabbedPane\\bug4499556.d\\main.0.jta'
result: Failed. Execution failed: `main' threw exception: java.lang.NullPointerException: Cannot invoke "java.awt.Font.hashCode()" because "font" is null


test result: Failed. Execution failed: `main' threw exception: java.lang.NullPointerException: Cannot invoke "java.awt.Font.hashCode()" because "font" is null