i running on Linux my junit test with openJDK 11 and got following error:
java.lang.ClassCastException: class sun.font.CompositeFont cannot be cast to class sun.font.PhysicalFont (sun.font.CompositeFont and sun.font.PhysicalFont are in module java.desktop of loader 'bootstrap')
at java.desktop/sun.font.SunFontManager.getDefaultPhysicalFont(SunFontManager.java:1086)
at java.desktop/sun.font.SunFontManager.initialiseDeferredFont(SunFontManager.java:965)
at java.desktop/sun.font.SunFontManager.findOtherDeferredFont(SunFontManager.java:903)
at java.desktop/sun.font.SunFontManager.findDeferredFont(SunFontManager.java:919)
at java.desktop/sun.font.SunFontManager.findFont2D(SunFontManager.java:2120)
at java.desktop/java.awt.Font.getFont2D(Font.java:506)
at java.desktop/java.awt.Font.canDisplayUpTo(Font.java:2246)
at java.desktop/java.awt.font.TextLayout.singleFont(TextLayout.java:469)
at java.desktop/java.awt.font.TextLayout.<init>(TextLayout.java:530)
at org.apache.poi.ss.util.SheetUtil.getDefaultCharWidth(SheetUtil.java:275)
at org.apache.poi.xssf.streaming.AutoSizeColumnTracker.<init>(AutoSizeColumnTracker.java:117)
at org.apache.poi.xssf.streaming.SXSSFSheet.<init>(SXSSFSheet.java:82)
at org.apache.poi.xssf.streaming.SXSSFWorkbook.createAndRegisterSXSSFSheet(SXSSFWorkbook.java:658)
at org.apache.poi.xssf.streaming.SXSSFWorkbook.createSheet(SXSSFWorkbook.java:679)
at com.textb2.ui.controller.ExcelCreator.newSheet(ExcelCreator.java:135)
at com.textb2.ui.controller.ExcelCreator.buildExcel(ExcelCreator.java:182)
at com.textb2.ui.controller.ExcelCreatorTest.testNoData(ExcelCreatorTest.java:91)
at com.textb2.ui.controller.ExcelCreatorTest.testGermany(ExcelCreatorTest.java:53)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Not sure but it must have something to do with fonts in /usr/share/fonts. At the moment i have no fonts there. I know that openJdk11 does not includes fonts anymore. But I'm not sure what to do.
Thanks ...
Just found a bug in an older version which is already fixed: https://bugs.java.com/bugdatabase/view_bug.do?bug_id=JDK-8144703
It seems OpenJDK 11 does not include some font-related stuff any more and your operating system is currently not providing any by itself.
You can try to install some font-related packages in your operating system to see if that solves the problem.
See also the release notes at https://www.oracle.com/technetwork/java/javase/11-relnote-issues-5012449.html#JDK-8191522
On Ubuntu 18.0.4 LTS, The following command fixed the issue
sudo apt-get install fontconfig
来源：https://stackoverflow.com/questions/54554625/openjdk-11-java-lang-classcastexception-class-sun-font-compositefont-cannot-be