ClassNotFoundException oracle.i18n.util.LocaleMapper on tomcat TLD scanning. ojdbc7 maven dep (xmlparserv2-12.1.0.2.jar transitive) causes this error

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I am receiving an error when running my spring-boot application with embedded-tomcat (haven't tried with server tomcat yet).

java.lang.IllegalStateException: Tomcat 7 reflection failed
    at org.springframework.boot.context.embedded.tomcat.SkipPatternJarScanner.scan(SkipPatternJarScanner.java:77)
    at org.apache.catalina.startup.TldConfig.execute(TldConfig.java:271)
    at org.apache.catalina.startup.TldConfig.lifecycleEvent(TldConfig.java:590)
    at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
    at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5522)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1571)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1561)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.reflect.InvocationTargetException: null
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.boot.context.embedded.tomcat.SkipPatternJarScanner.scan(SkipPatternJarScanner.java:73)
    ... 12 common frames omitted
Caused by: java.lang.NoClassDefFoundError: oracle/i18n/util/LocaleMapper
    at oracle.xml.parser.v2.XMLReader.setEncoding(XMLReader.java:980)
    at oracle.xml.parser.v2.XMLReader.checkXMLDecl(XMLReader.java:3284)
    at oracle.xml.parser.v2.XMLReader.pushXMLReader(XMLReader.java:570)
    at oracle.xml.parser.v2.XMLReader.pushXMLReader(XMLReader.java:274)
    at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:232)
    at org.apache.tomcat.util.digester.Digester.parse(Digester.java:1576)
    at org.apache.catalina.startup.TldConfig.tldScanStream(TldConfig.java:565)
    at org.apache.catalina.startup.TldConfig.tldScanJar(TldConfig.java:513)
    at org.apache.catalina.startup.TldConfig.access$200(TldConfig.java:61)
    at org.apache.catalina.startup.TldConfig$TldJarScannerCallback.scan(TldConfig.java:300)
    at org.apache.tomcat.util.scan.StandardJarScanner.process(StandardJarScanner.java:259)
    at org.apache.tomcat.util.scan.StandardJarScanner.scan(StandardJarScanner.java:221)
    ... 17 common frames omitted
Caused by: java.lang.ClassNotFoundException: oracle.i18n.util.LocaleMapper
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:335)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 29 common frames omitted

On further inspection, It appears as though the previous version of the orai18n.jar depended on by the ojdbc7 maven dep contained this class in vesion 11.2.0.3 but the newer (12.1.0.2) file does not contain it.

ojdbc spring-boot tomcat7 jstl java
5 Answers

It's a conflict with xmlparserv2. Try this :

    <dependency>
        <groupId>com.oracle.jdbc</groupId>
        <artifactId>ojdbc7</artifactId>
        <version>12.1.0.2</version>
        <exclusions>
            <exclusion>
                    <groupId>com.oracle.jdbc</groupId>
                    <artifactId>xmlparserv2</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
user_103480400

In my case I had the Oracle Jars installed under $CATALINA_HOME/lib to be able to set up a JNDI DB connection in Tomcat, simply removing xmlparserv2.jar from the $CATALINA_HOME/lib directory resolved the problem.

user_9967670

New change for xdb instead com.oracle.jdbc use: com.oracle.ojdbc.

<dependency>
     <groupId>com.oracle.ojdbc</groupId>
     <artifactId>xdb</artifactId>
     <version>19.3.0.0</version>
     <exclusions>
          <exclusion>
               <groupId>com.oracle.ojdbc</groupId>
               <artifactId>xmlparserv2</artifactId>
          </exclusion>
     </exclusions>
</dependency>
user_30824580

The cause of the problem is as Serri said, except for the solution given by Serri I think if you use IntelliJ IDEA as a coding tool, please check Project Structure Artifacts to remove the dependency on xmlparserv2, this worked for me

Remove conflicting dependencies

user_137433250
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