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I'm using 20.04, in there the Apache POI is still the very old version 4.0.1.

Could you consider to upgrade the POI to newer version i.e. 5.0? Because it is having a signature problem with other packages as shown below.

PHP Fatal error:  Uncaught [[o:Exception]:"java.lang.Exception: CreateInstance failed:   
new org.apache.poi.xssf.usermodel.XSSFWorkbook((o:InputStream)  
[o:FileInputStream]). Cause: java.lang.SecurityException: class  
 "org.apache.poi.util.PackageHelper"'s signer information does not match signer information of other classes in the same package VM:  
11.0.10@https://ubuntu.com/" at:\n#-19  
java.base/java.lang.ClassLoader.checkCerts(ClassLoader.java:1151)\n#-18  
java.base/java.lang.ClassLoader.preDefineClass(ClassLoader.java:906)\n#-17  
java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1015)\n#-16 java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174 
)\n#-15  
org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:2419)\n#-14  
org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:865)\n#-13  
org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1334)\n#-12  
org.apache.catalina.loader.WebappClassLoaderBase.loadClas in /var/www/erp/library/javabridge-7.2.1/java/Java.inc on line 223
karel
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Brooke Tsui
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    Does this answer your question? [Why don't the Ubuntu repositories have the latest versions of software?](https://askubuntu.com/questions/151283/why-dont-the-ubuntu-repositories-have-the-latest-versions-of-software) – user535733 Mar 06 '21 at 14:35
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    See also https://tracker.debian.org/pkg/libapache-poi-java for why 5.0 has not even been packaged yet for Debian (Hint: They could use more help from community members like you) – user535733 Mar 06 '21 at 14:36

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