Pierre Mauduit ( 
https://osgeo-org.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A585344fb-ece9-47e9-8382-30cea0b98063
 ) *created* an issue

GeoServer ( 
https://osgeo-org.atlassian.net/browse/GEOS?atlOrigin=eyJpIjoiNTA1ODE1ZDgzMWYxNDVjZWFjNWY4M2M2NDUxNjA5OGIiLCJwIjoiaiJ9
 ) / Bug ( 
https://osgeo-org.atlassian.net/browse/GEOS-9702?atlOrigin=eyJpIjoiNTA1ODE1ZDgzMWYxNDVjZWFjNWY4M2M2NDUxNjA5OGIiLCJwIjoiaiJ9
 ) GEOS-9702 ( 
https://osgeo-org.atlassian.net/browse/GEOS-9702?atlOrigin=eyJpIjoiNTA1ODE1ZDgzMWYxNDVjZWFjNWY4M2M2NDUxNjA5OGIiLCJwIjoiaiJ9
 ) icu4j 3.4.4 does not support Java runtimes with Patch number > 255 ( 
https://osgeo-org.atlassian.net/browse/GEOS-9702?atlOrigin=eyJpIjoiNTA1ODE1ZDgzMWYxNDVjZWFjNWY4M2M2NDUxNjA5OGIiLCJwIjoiaiJ9
 )

Issue Type: Bug Affects Versions: 2.17.0 Assignee: Unassigned Components: 
web-app Created: 20/Jul/20 12:05 PM Priority: Medium Reporter: Pierre Mauduit ( 
https://osgeo-org.atlassian.net/secure/ViewProfile.jspa?accountId=557058%3A585344fb-ece9-47e9-8382-30cea0b98063
 )

Encountered with last jetty:9-jre8 docker image with a GeoServer 2.17:

2020-07-20 09:15:23.577:WARN:oejw.WebAppContext:main: Failed startup of context 
o.e.j.w.WebAppContext@2698dc7{GeoServer,/geoserver,file: /// var 
/lib/jetty/webapps/geoserver/,UNAVAILABLE}{/ var /lib/jetty/webapps/geoserver}
org.springframework.beans.factory.BeanCreationException: Error occured reading 
security configuration; nested exception is java.lang.RuntimeException: 
org.jasypt.exceptions.EncryptionInitializationException: 
java.lang.NoClassDefFoundError: Could not initialize class 
com.ibm.icu.impl.ICUDebug
        at 
org.geoserver.security.GeoServerSecurityManager.reload(GeoServerSecurityManager.java:432)
[...]
Caused by: 
java.lang.RuntimeException: 
org.jasypt.exceptions.EncryptionInitializationException: 
java.lang.NoClassDefFoundError: Could not initialize class 
com.ibm.icu.impl.ICUDebug
        at 
org.geoserver.security.GeoServerSecurityManager.getMasterPassword(GeoServerSecurityManager.java:1765)
[...]
Caused by: 
org.jasypt.exceptions.EncryptionInitializationException: 
java.lang.NoClassDefFoundError: Could not initialize class 
com.ibm.icu.impl.ICUDebug
        at 
org.jasypt.encryption.pbe.StandardPBEByteEncryptor.initialize(StandardPBEByteEncryptor.java:716)
Caused by: 
java.lang.NoClassDefFoundError: Could not initialize class 
com.ibm.icu.impl.ICUDebug
        at 
com.ibm.icu.impl.NormalizerDataReader.<clinit>(NormalizerDataReader.java:300)

Using the following Java class indeed fails:

% cat TestClass.java
class TestClass {

   public static void main( String [] args) {
       try {
         Class.forName( "com.ibm.icu.impl.ICUDebug" );
         System.out.println( "it works" );
       } catch (ClassNotFoundException e) {
         System.err.println( " Class not found" );
       }
   }

}

% java -cp / var /lib/jetty/webapps/geoserver/WEB-INF/lib/icu4j-3.4.4.jar:. 
TestClass
Exception in thread "main" java.lang.ExceptionInInitializerError
        at java.lang. Class.forName0(Native Method)
        at java.lang. Class.forName( Class.java:264)
        at TestClass.main(TestClass.java:6)
Caused by: java.lang.IllegalArgumentException: Invalid version number: Version 
number may be negative or greater than 255
        at com.ibm.icu.util.VersionInfo.getInstance(VersionInfo.java:188)
        at com.ibm.icu.impl.ICUDebug.getInstanceLenient(ICUDebug.java:65)
        at com.ibm.icu.impl.ICUDebug.<clinit>(ICUDebug.java:69)
        ... 3 more

Here is the Java version used:

% java -version
openjdk version "1.8.0_262"
OpenJDK Runtime Environment (build 1.8.0_262-b10)
OpenJDK 64-Bit Server VM (build 25.262-b10, mixed mode)

Here is a redhat (requires to log in) related issue: 
https://access.redhat.com/solutions/5026361 which recommends to downgrade to a 
build < 255.

Launching the same code snippet on a previous version of the Java runtime works:

% java -cp / var /lib/jetty/webapps/geoserver/WEB-INF/lib/icu4j-3.4.4.jar:. 
TestClass
it works
% java -version
openjdk version "1.8.0_252"
OpenJDK Runtime Environment (build 1.8.0_252-b09)
OpenJDK 64-Bit Server VM (build 25.252-b09, mixed mode)

( 
https://osgeo-org.atlassian.net/browse/GEOS-9702#add-comment?atlOrigin=eyJpIjoiNTA1ODE1ZDgzMWYxNDVjZWFjNWY4M2M2NDUxNjA5OGIiLCJwIjoiaiJ9
 ) Add Comment ( 
https://osgeo-org.atlassian.net/browse/GEOS-9702#add-comment?atlOrigin=eyJpIjoiNTA1ODE1ZDgzMWYxNDVjZWFjNWY4M2M2NDUxNjA5OGIiLCJwIjoiaiJ9
 )

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