java.lang.NoClassDefFoundError at startup

Running the newest Docker image (13) with additional java options on startup:
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• CONTEXT_PATH=/xwiki
• JAVA_OPTS="-Djava.awt.headless=true -XX:+UseParallelGC -XX:MaxGCPauseMillis=100"

1. Provide a name instead of an auto-generated id for the xwiki permanent directory configured in the Dockerfile,
2. to make it simpler to identify in 'docker volume ls'.
   volumes:

• /home/winkel/work/xwiki/docker-volumes/xwiki:/usr/local/xwiki
• /home/winkel/work/xwiki/docker-volumes/tomcat-conf:/usr/local/tomcat/conf
• /home/winkel/work/xwiki/docker-volumes/tomcat-logs:/usr/local/tomcat/logs

The headless option wasn't there from beginning but changed later with a new build of the docker container.There are some errors on startup of the container now:

2021-01-29 10:35:43,213 [XWiki Solr index thread] ERROR o.x.s.s.i.DefaultSolrIndexer - Failed to process entry [INDEX heikeswiki:AppWithinMinutes.ClassEditSheet]
java.lang.UnsatisfiedLinkError: /opt/java/openjdk/lib/libawt_xawt.so: libXtst.so.6: cannot open shared object file: No such file or directory
at java.base/java.lang.ClassLoader$NativeLibrary.load0(Native Method)
at java.base/java.lang.ClassLoader$NativeLibrary.load(ClassLoader.java:2442)
at java.base/java.lang.ClassLoader$NativeLibrary.loadLibrary(ClassLoader.java:2498)
at java.base/java.lang.ClassLoader.loadLibrary0(ClassLoader.java:2694)
at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2627)
at java.base/java.lang.Runtime.load0(Runtime.java:768)
at java.base/java.lang.System.load(System.java:1837)
at java.base/java.lang.ClassLoader$NativeLibrary.load0(Native Method)
at java.base/java.lang.ClassLoader$NativeLibrary.load(ClassLoader.java:2442)
at java.base/java.lang.ClassLoader$NativeLibrary.loadLibrary(ClassLoader.java:2498)
at java.base/java.lang.ClassLoader.loadLibrary0(ClassLoader.java:2694)
at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2648)
at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:830)
at java.base/java.lang.System.loadLibrary(System.java:1873)
at java.desktop/java.awt.Toolkit$3.run(Toolkit.java:1395)
at java.desktop/java.awt.Toolkit$3.run(Toolkit.java:1393)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.desktop/java.awt.Toolkit.loadLibraries(Toolkit.java:1392)
at java.desktop/java.awt.Toolkit.(Toolkit.java:1425)
at java.desktop/sun.awt.AppContext$2.run(AppContext.java:282)
at java.desktop/sun.awt.AppContext$2.run(AppContext.java:271)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.desktop/sun.awt.AppContext.initMainAppContext(AppContext.java:271)
at java.desktop/sun.awt.AppContext$3.run(AppContext.java:326)
at java.desktop/sun.awt.AppContext$3.run(AppContext.java:309)
at java.base/java.security.AccessController.doPrivileged(Native Method)
at java.desktop/sun.awt.AppContext.getAppContext(AppContext.java:308)
at java.desktop/javax.imageio.spi.IIORegistry.getDefaultInstance(IIORegistry.java:129)
at java.desktop/javax.imageio.ImageIO.(ImageIO.java:66)
at org.apache.tika.parser.image.ImageParser.parse(ImageParser.java:177)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:143)
at org.apache.tika.Tika.parseToString(Tika.java:527)
at org.xwiki.tika.internal.TikaUtils.parseToString(TikaUtils.java:153)
at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getContentAsText(AbstractSolrMetadataExtractor.java:509)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setAttachment(DocumentSolrMetadataExtractor.java:281)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setAttachments(DocumentSolrMetadataExtractor.java:261)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setExtras(DocumentSolrMetadataExtractor.java:187)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setFieldsInternal(DocumentSolrMetadataExtractor.java:135)
at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getSolrDocument(AbstractSolrMetadataExtractor.java:133)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.getSolrDocument(DefaultSolrIndexer.java:499)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.processBatch(DefaultSolrIndexer.java:408)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.run(DefaultSolrIndexer.java:376)
at java.base/java.lang.Thread.run(Thread.java:834)
2021-01-29 10:35:43,236 [XWiki Solr index thread] ERROR o.x.s.s.i.DefaultSolrIndexer - Failed to process entry [INDEX Attachment heikeswiki:AppWithinMinutes.ClassEditSheet@arrow-move.png]
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageIO
at org.apache.tika.parser.image.ImageParser.parse(ImageParser.java:177)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:143)
at org.apache.tika.Tika.parseToString(Tika.java:527)
at org.xwiki.tika.internal.TikaUtils.parseToString(TikaUtils.java:153)
at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getContentAsText(AbstractSolrMetadataExtractor.java:509)
at org.xwiki.search.solr.internal.metadata.AttachmentSolrMetadataExtractor.setLocaleAndContentFields(AttachmentSolrMetadataExtractor.java:111)
at org.xwiki.search.solr.internal.metadata.AttachmentSolrMetadataExtractor.setFieldsInternal(AttachmentSolrMetadataExtractor.java:93)
at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getSolrDocument(AbstractSolrMetadataExtractor.java:133)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.getSolrDocument(DefaultSolrIndexer.java:499)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.processBatch(DefaultSolrIndexer.java:408)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.run(DefaultSolrIndexer.java:376)
at java.base/java.lang.Thread.run(Thread.java:834)
2021-01-29 10:35:43,255 [XWiki Solr index thread] ERROR o.x.s.s.i.DefaultSolrIndexer - Failed to process entry [INDEX Attachment heikeswiki:AppWithinMinutes.ClassEditSheet@bulletcross.png]
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageIO
at org.apache.tika.parser.image.ImageParser.parse(ImageParser.java:177)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:143)
at org.apache.tika.Tika.parseToString(Tika.java:527)
at org.xwiki.tika.internal.TikaUtils.parseToString(TikaUtils.java:153)
at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getContentAsText(AbstractSolrMetadataExtractor.java:509)
at org.xwiki.search.solr.internal.metadata.AttachmentSolrMetadataExtractor.setLocaleAndContentFields(AttachmentSolrMetadataExtractor.java:111)
at org.xwiki.search.solr.internal.metadata.AttachmentSolrMetadataExtractor.setFieldsInternal(AttachmentSolrMetadataExtractor.java:93)
at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getSolrDocument(AbstractSolrMetadataExtractor.java:133)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.getSolrDocument(DefaultSolrIndexer.java:499)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.processBatch(DefaultSolrIndexer.java:408)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.run(DefaultSolrIndexer.java:376)
at java.base/java.lang.Thread.run(Thread.java:834)

and in the further processing there are a many of:

2021-01-29 08:54:07,360 [XWiki Solr index thread] ERROR o.x.s.s.i.DefaultSolrIndexer - Failed to process entry [INDEX winkelswiki:IoT and Make.Sensors.BME280.WebHome]
java.lang.NoClassDefFoundError: Could not initialize class org.apache.pdfbox.pdmodel.PDDocument
at org.apache.tika.parser.pdf.PDFParser.getPDDocument(PDFParser.java:189)
at org.apache.tika.parser.pdf.PDFParser.parse(PDFParser.java:148)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:143)
at org.apache.tika.Tika.parseToString(Tika.java:527)
at org.xwiki.tika.internal.TikaUtils.parseToString(TikaUtils.java:153)
at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getContentAsText(AbstractSolrMetadataExtractor.java:509)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setAttachment(DocumentSolrMetadataExtractor.java:281)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setAttachments(DocumentSolrMetadataExtractor.java:261)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setExtras(DocumentSolrMetadataExtractor.java:187)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setFieldsInternal(DocumentSolrMetadataExtractor.java:135)
at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getSolrDocument(AbstractSolrMetadataExtractor.java:133)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.getSolrDocument(DefaultSolrIndexer.java:499)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.processBatch(DefaultSolrIndexer.java:408)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.run(DefaultSolrIndexer.java:376)
at java.base/java.lang.Thread.run(Thread.java:834)

I don't know from where the problem comes from but it isn't for PDF attachments only:

2021-01-28 22:33:07,481 [XWiki Solr index thread] ERROR o.x.s.s.i.DefaultSolrIndexer - Failed to process entry [INDEX xwiki:XWiki.XWikiUserSheet]
java.lang.NoClassDefFoundError: Could not initialize class javax.imageio.ImageIO
at org.apache.tika.parser.image.ImageParser.parse(ImageParser.java:177)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.CompositeParser.parse(CompositeParser.java:280)
at org.apache.tika.parser.AutoDetectParser.parse(AutoDetectParser.java:143)
at org.apache.tika.Tika.parseToString(Tika.java:527)
at org.xwiki.tika.internal.TikaUtils.parseToString(TikaUtils.java:153)
at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getContentAsText(AbstractSolrMetadataExtractor.java:509)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setAttachment(DocumentSolrMetadataExtractor.java:281)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setAttachments(DocumentSolrMetadataExtractor.java:261)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setExtras(DocumentSolrMetadataExtractor.java:187)
at org.xwiki.search.solr.internal.metadata.DocumentSolrMetadataExtractor.setFieldsInternal(DocumentSolrMetadataExtractor.java:135)
at org.xwiki.search.solr.internal.metadata.AbstractSolrMetadataExtractor.getSolrDocument(AbstractSolrMetadataExtractor.java:133)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.getSolrDocument(DefaultSolrIndexer.java:499)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.processBatch(DefaultSolrIndexer.java:408)
at org.xwiki.search.solr.internal.DefaultSolrIndexer.run(DefaultSolrIndexer.java:376)
at java.base/java.lang.Thread.run(Thread.java:834)

 A restart without the headless option let the errors disappear.