**Environment**: GraalVM 22.3.0 with jdk 19, Windows OS. **Description**: Create a native image of Swing application using GraalVM and run it with ` -Dsun.awt.fontconfig=fontconfig.properties.src` java property. `java.lang.Error: java.home property not set` error is thrown.
For more details see https://github.com/oracle/graal/issues/4875. **Solution**: The error is thrown by the code from [FontConfiguration.findFontConfigFile()](https://github.com/openjdk/jdk19u/blob/c9d485792b99233f381dcdfd69838e7b973909bd/src/java.desktop/share/classes/sun/awt/FontConfiguration.java#L175) method. GraalVM does not set `java.home` property, that is why the `java.lang.Error: java.home property not set` is thrown. `FontConfiguration.findFontConfigFile()` method compares `java.home` property to null before checking user provided `sun.awt.fontconfig` java property. The proposed fix swaps the order of `java.home` and `sun.awt.fontconfig` properties checking to avoid using `java.home` property in case `sun.awt.fontconfig` is set. **Steps to reproduce**: - Download graal 22.3.0 jdk 19 for Windows from [GraalVM Community Edition 22.3.0](https://github.com/graalvm/graalvm-ce-builds/releases/tag/vm-22.3.0) page. - Install native-image graalvm-ce-java19-22.3.0\bin\gu.cmd install native-image - Create and compile `SwingSample.java` sample import java.awt.*; import javax.swing.*; public class SwingSample { public static void main(String[] args) throws Exception { SwingUtilities.invokeAndWait(() -> { JFrame frame = new JFrame("Hello World"); JButton button = new JButton("Hello"); button.addActionListener(e -> { System.out.printf("Hello, World!%n"); }); JPanel panel = new JPanel(new FlowLayout()); panel.add(button); frame.add(panel); frame.setSize(400, 300); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); }); } } - Run native-image-agent to generate configuration files graalvm-ce-java19-22.3.0\bin\java.cmd -agentlib:native-image-agent=config-output-dir=conf-dir SwingSample - Copy `graalvm-ce-java19-22.3.0\lib\fontconfig.properties.src` file to the sample dir - Generate native image with configuration files and `-Djava.awt.headless=false `, `-Dsun.awt.fontconfig=fontconfig.properties.src` java properties call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvars64" graalvm-ce-java19-22.3.0\bin\native-image.cmd --no-fallback -Djava.awt.headless=false -Dsun.awt.fontconfig=fontconfig.properties.src -H:ResourceConfigurationFiles=conf-dir/resource-config.json -H:SerializationConfigurationFiles=conf-dir/serialization-config.json -H:ReflectionConfigurationFiles=conf-dir/reflect-config.json -H:JNIConfigurationFiles=conf-dir/jni-config.json SwingSample - Run the native image with `-Dsun.awt.fontconfig=fontconfig.properties.src` java property. swingsample.exe -Dsun.awt.fontconfig=fontconfig.properties.src Exception in thread "main" java.lang.reflect.InvocationTargetException at java.desktop@19.0.1/java.awt.EventQueue.invokeAndWait(EventQueue.java:1371) at java.desktop@19.0.1/java.awt.EventQueue.invokeAndWait(EventQueue.java:1346) at java.desktop@19.0.1/javax.swing.SwingUtilities.invokeAndWait(SwingUtilities.java:1480) at SwingSample.main(SwingSample.java:7) Caused by: java.lang.Error: java.home property not set at java.desktop@19.0.1/sun.awt.FontConfiguration.findFontConfigFile(FontConfiguration.java:180) at java.desktop@19.0.1/sun.awt.FontConfiguration.<init>(FontConfiguration.java:97) at java.desktop@19.0.1/sun.awt.windows.WFontConfiguration.<init>(WFontConfiguration.java:41) ------------- Commit messages: - 'java.home property not set' error in Graal when sun.awt.fontconfig java property is set on Windows Changes: https://git.openjdk.org/jdk/pull/11559/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11559&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8298266 Stats: 16 lines in 1 file changed: 8 ins; 8 del; 0 mod Patch: https://git.openjdk.org/jdk/pull/11559.diff Fetch: git fetch https://git.openjdk.org/jdk pull/11559/head:pull/11559 PR: https://git.openjdk.org/jdk/pull/11559
