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I'm trying to build a slightly modified version of EJBCA, and while I'm able to compile it with no problems, I get class not found exceptions from code that that I did not modify. Since there are plenty of EJBCA deployments, I wanted to ask for advice on how to deploy it.
The modifications I've done to the code are minimal (just printed some extra information on the log during the HMAC calculation/validation), so should not cause problems by themselves.

I've downloaded the 31372 revision (latest when I downloaded) from the trunk repository for the EJBCA project (https://svn.cesecore.eu/svn/ejbca), and trying to make it work in a virtual machine running a fresh install of Ubuntu 18.04.1 LTS. I´m using the openJDK-8-jdk package as virtual machine, wildfly 10.1.0 Final (one of the errors I was having went away the moment I switched to the recommended Wildfly 10) , and MariaDB 10.1 (package mariadb-server from the Ubuntu repository).

After following the guide available in https://www.ejbca.org/docs/WildFly_10___JBoss_EAP_7.0.html I'm able to build and deploy the project without any problems, using the "ant clean deployear", but when trying to run the next command in the guide, "ant runinstall", I get the following error:

[java] log4j:WARN Error during default initialization

[java] java.lang.NoClassDefFoundError: org/w3c/dom/ls/DocumentLS

[java]  at java.base/java.lang.ClassLoader.defineClass1(Native Method)

[java]  at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1009)

[java]  at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)

[java]  at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:802)

[java]  at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:700)

[java]  at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:623)

[java]  at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)

[java]  at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)

[java]  at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)

[java]  at java.base/java.lang.ClassLoader.defineClass1(Native Method)

[java]  at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1009)

[java]  at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:174)

[java]  at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(BuiltinClassLoader.java:802)

[java]  at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(BuiltinClassLoader.java:700)

[java]  at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(BuiltinClassLoader.java:623)

[java]  at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)

[java]  at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)

[java]  at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)

[java]  at org.apache.xerces.util.ObjectFactory.findProviderClass(Unknown Source)

[java]  at org.apache.xerces.parsers.AbstractDOMParser.setDocumentClassName(Unknown Source)

[java]  at org.apache.xerces.parsers.AbstractDOMParser.reset(Unknown Source)

[java]  at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)

[java]  at org.apache.xerces.parsers.DOMParser.parse(Unknown Source)

[java]  at org.apache.xerces.jaxp.DocumentBuilderImpl.parse(Unknown Source)

[java]  at org.apache.log4j.xml.DOMConfigurator$2.parse(DOMConfigurator.java:769)

[java]  at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:871)

[java]  at org.apache.log4j.xml.DOMConfigurator.doConfigure(DOMConfigurator.java:778)

[java]  at org.apache.log4j.helpers.OptionConverter.selectAndConfigure(OptionConverter.java:526)

[java]  at org.apache.log4j.LogManager.<clinit>(LogManager.java:127)

[java]  at org.apache.log4j.Logger.getLogger(Logger.java:117)

[java]  at org.ejbca.ui.cli.infrastructure.library.CommandLibrary.<init>(CommandLibrary.java:44)

[java]  at org.ejbca.ui.cli.infrastructure.library.CommandLibrary.<clinit>(CommandLibrary.java:39)

[java]  at org.ejbca.ui.cli.EjbcaEjbCli.main(EjbcaEjbCli.java:29)

[java] Caused by: java.lang.ClassNotFoundException: org.w3c.dom.ls.DocumentLS

[java]  at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:583)

[java]  at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:190)

[java]  at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:499)

[java]  ... 33 more

[java] log4j:WARN No appenders could be found for logger (org.jboss.logging).

[java] log4j:WARN Please initialize the log4j system properly.

[java] log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

[java] WARNING: An illegal reflective access operation has occurred

[java] WARNING: Illegal reflective access by org.xnio.nio.NioXnio$2 (file:/home/alpha1983/ejbca_svn/dist/ejbca-ejb-cli/lib/jboss-client.jar) to constructor sun.nio.ch.EPollSelectorProvider()

[java] WARNING: Please consider reporting this to the maintainers of org.xnio.nio.NioXnio$2

[java] WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations

[java] WARNING: All illegal access operations will be denied in a future release

BUILD FAILED

The version of log4j used and bundled within the sources of EJBCA is log4j-1.2.17 (located here: https://svn.cesecore.eu/svn/ejbca/trunk/ejbca/lib/), a rather old version. The lib tries to find the DocumentLS class that is deprecated in xerces, so I have tried to use a lower version of xerces, but was not able to download a package from the ubuntu repositories that would implement the required class. Upgrading the log4j to a newer version 2.x is not a solution either, since it would entail changing the EJBCA code in too many places.
Since people are able to deploy EJBCA, I'm guessing that there's an easier way around this issue than a re-write of the sources, so I'm asking for advice.

I'm guessing that there's some field that I'm not configuring, but so far I haven't been able to figure out which one it is, and wanted to ask for advice on the topic.
Thanks in advance