ClassNotFoundException HikariCP with gretty plugin using Jetty 9

Question

I created a Spring demo web application as a proof of concept. It works fine when I run the class JettyWrapper (embedded Jetty). However when I'm trying to run run Jetty 9 using the gretty plugin I'm getting a ClassNotFoundException of HikariCP even adding the HikariCP in the plugin classpath.

    jetty.xml config file

    ...
    <New class="com.zaxxer.hikari.HikariDataSource">
        <Arg>
            <New id="hikariConfig" class="com.zaxxer.hikari.HikariConfig">
                <Set name="poolName"><SystemProperty name="hikaricp.poolName" default="HikariCP"/></Set>
                <Set name="driverClassName"><SystemProperty name="hikaricp.driverClassName" default="org.hsqldb.jdbc.JDBCDriver"/></Set>
                <Set name="idleTimeout"><SystemProperty name="hikaricp.idleTimeout" default="10000"/></Set>
                <Set name="maximumPoolSize"><SystemProperty name="hikaricp.maximumPoolSize" default="5"/></Set>
                <Set name="username"><SystemProperty name="hikaricp.username" default="SA"/></Set>
                <Set name="password"><SystemProperty name="hikaricp.password" default=""/></Set>
                <Set name="jdbcUrl"><SystemProperty name="hikaricp.jdbcUrl" default="jdbc:hsqldb:hsql://localhost/demodb"/></Set>
                <Set name="connectionTestQuery"><SystemProperty name="hikaricp.connectionTestQuery" default="SET DATABASE SQL SYNTAX MYS TRUE"/></Set>
                <Set name="connectionInitSql"><SystemProperty name="hikaricp.connectionInitSql" default="SET DATABASE SQL SYNTAX MYS TRUE"/>
                </Set>
            </New>
        </Arg>
    </New>
    ...


Exception in thread "main" java.lang.ClassNotFoundException: com.zaxxer.hikari.HikariDataSource
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at org.eclipse.jetty.util.Loader.loadClass(Loader.java:86)
    at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.nodeClass(XmlConfiguration.java:364)
    at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:754)
    at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.itemValue(XmlConfiguration.java:1125)
    at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.value(XmlConfiguration.java:1030)
    at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.newObj(XmlConfiguration.java:775)
    at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:423)
    at org.eclipse.jetty.xml.XmlConfiguration$JettyXmlConfiguration.configure(XmlConfiguration.java:298)
    at org.eclipse.jetty.xml.XmlConfiguration.configure(XmlConfiguration.java:248)
    at org.eclipse.jetty.xml.XmlConfiguration$configure.call(Unknown Source)
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:125)
    at org.akhikhl.gretty.JettyConfigurerImpl.applyJettyXml(JettyConfigurerImpl.groovy:64)
    at org.akhikhl.gretty.JettyConfigurer$applyJettyXml$0.call(Unknown Source)

If anyone can help with any tips and/or directions will be greatly appreciated.

EDITED: After I got this problem solved, I found a new problem related what made me another post . In that case I had some extra resources to be added in the classpath (configs dir) and I spent a couple hours until I found a non documented feature. Now everything is working fine.

Answer 1

How are you adding the library to Gretty classpath?

I've done something similar with this line in my gradle.build:

dependencies { ///... gretty 'my:library:version' }

And it worked great

http://akhikhl.github.io/gretty-doc/Servlet-container-classpath.html

By the way, I'm also using HikariCP in a web app launched by Gretty, but in my case I'm instantiating the pool programatically, and the Hikari library is in the webapp classpath, not in the container's.