How can i make a simple custom Maven Library run on a Liferay Tomcat 7.4 Server?

im Developing a Liferay 7.4 Portlet with CDI Beans. I want to add to this Portlet a selfmade Java Library as a dependency. Unfortunately once i add this dependency to my portlet i get an Exception. Do i have to make this dependency an OSGi Module? If its true, is there an easy way to achieve this, like plugins in a pom.xml file?

Here is my pom.xml from my Custom Library:

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>net.mycontent</groupId>
    <artifactId>testdependency</artifactId>
    <version>0.0.1</version>

    <name>testdependency</name>
    <url>http://www.example.com</url>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

    <repositories>
        <repository>
            <id>nexus</id>
            <name>maven-public</name>
            <url>http://192.168.177.69:8081/repository/maven-public/</url>
        </repository>
    </repositories>

    <distributionManagement>
        <repository>
            <uniqueVersion>false</uniqueVersion>
            <id>nexus</id>
            <name>t4u-core</name>
            <url>http://192.168.177.69:8081/repository/Temiz4u-all-m2/</url>
            <layout>default</layout>
        </repository>
    </distributionManagement>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.11</version>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <resources>
            <resource>
                <directory>src/main/resources</directory>
                <filtering>true</filtering>
            </resource>
        </resources>

        <finalName>testdependency</finalName>
        <plugins>
            <plugin>
                <groupId>org.sonatype.plugins</groupId>
                <artifactId>nexus-staging-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <id>default-deploy</id>
                        <phase>deploy</phase>
                        <goals>
                            <goal>deploy</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <serverId>nexus</serverId>
                    <nexusUrl>http://192.168.177.69:8081</nexusUrl>
                    <skipStaging>true</skipStaging>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <encoding>UTF-8</encoding>
                    <source>${maven.compiler.source}</source>
                    <target>${maven.compiler.target}</target>
                </configuration>
            </plugin>
            <plugin>
                <artifactId>maven-jar-plugin</artifactId>
            </plugin>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <archive>
                        <manifest>
                            <mainClass>net.mycontent.testdependency.App</mainClass>
                        </manifest>
                    </archive>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
            </plugin>
        </plugins>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven 
                defaults (may be moved to parent pom) -->
            <plugins>
                <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.1.0</version>
                </plugin>
                <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.8.0</version>
                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>2.22.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-jar-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>2.5.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>2.8.2</version>
                </plugin>
                <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
                <plugin>
                    <artifactId>maven-site-plugin</artifactId>
                    <version>3.7.1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-project-info-reports-plugin</artifactId>
                    <version>3.0.0</version>
                </plugin>
                <plugin>
                    <groupId>org.sonatype.plugins</groupId>
                    <artifactId>nexus-staging-maven-plugin</artifactId>
                    <version>1.6.13</version>
                    <executions>
                        <execution>
                            <id>default-deploy</id>
                            <phase>deploy</phase>
                            <goals>
                                <goal>deploy</goal>
                            </goals>
                        </execution>
                    </executions>
                    <configuration>
                        <serverId>nexus</serverId>
                        <nexusUrl>http://192.168.177.69:8081</nexusUrl>
                        <skipStaging>true</skipStaging>
                    </configuration>
                </plugin>
            </plugins>
        </pluginManagement>
    </build>
</project>

And here is my pom.xml from my Liferay 7.4 CDI portlet:

<?xml version="1.0"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <!-- Note: The parent POM contains "thin" and "cdi" profiles -->
    <parent>
        <groupId>com.liferay.faces.archetype</groupId>
        <artifactId>com.liferay.faces.archetype.parent</artifactId>
        <version>6.1.1</version>
    </parent>
    <groupId>com.mycompany</groupId>
    <artifactId>com.mycompany.my.primefaces.portlet</artifactId>
    <packaging>war</packaging>
    <name>com.mycompany.my.primefaces.portlet</name>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <faces.impl.scope>compile</faces.impl.scope>
        <war.dependency.scope>compile</war.dependency.scope>
        <zuzaetzliche.dependencies>compile</zuzaetzliche.dependencies>
        <t4u-core.version>0.7.635</t4u-core.version>
        <slf4j.version>1.7.36</slf4j.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>
    <repositories>
        <repository>
            <id>nexus</id>
            <name>maven-public</name>
            <url>http://192.168.177.69:8081/repository/maven-public/</url>
        </repository>
    </repositories>
    <profiles>
        <profile>
            <id>thin</id>
            <!-- Note: The properties in this profile override the values set in the 
                parent POM in order to include PrimeFaces -->
            <properties>
                <osgi.dynamic.import.package>
                    DynamicImport-Package:\
                    ${osgi.dynamic.import.package.primefaces},\
                    ${osgi.dynamic.import.package.liferay.faces.bridge}
                </osgi.dynamic.import.package>
                <osgi.import.package>
                    Import-Package:\
                    ${osgi.import.package.primefaces},\
                    ${osgi.import.package.liferay.faces.bridge}
                </osgi.import.package>
            </properties>
        </profile>
    </profiles>
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
                <configuration>
                    <encoding>UTF-8</encoding>
                    <source>11</source>
                    <target>11</target>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-war-plugin</artifactId>
                <version>3.3.1</version>
            </plugin>
            <plugin>
                <groupId>org.sonatype.plugins</groupId>
                <artifactId>nexus-staging-maven-plugin</artifactId>
                <executions>
                    <execution>
                        <id>default-deploy</id>
                        <phase>deploy</phase>
                        <goals>
                            <goal>deploy</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <serverId>nexus</serverId>
                    <nexusUrl>http://192.168.177.69:8081</nexusUrl>
                    <skipStaging>true</skipStaging>
                </configuration>
            </plugin>
        </plugins>
        <pluginManagement><!-- lock down plugins versions to avoid using Maven 
                defaults (may be moved to parent pom) -->

            <plugins>
                <!-- clean lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#clean_Lifecycle -->
                <plugin>
                    <artifactId>maven-clean-plugin</artifactId>
                    <version>3.2.0</version>
                </plugin>
                <!-- default lifecycle, jar packaging: see https://maven.apache.org/ref/current/maven-core/default-bindings.html#Plugin_bindings_for_jar_packaging -->
                <plugin>
                    <artifactId>maven-resources-plugin</artifactId>
                    <version>3.0.2</version>
                </plugin>
                <plugin>
                    <artifactId>maven-compiler-plugin</artifactId>
                    <version>3.10.1</version>
                    <configuration>
                        <encoding>${project.build.sourceEncoding}</encoding>
                        <source>${maven.compiler.source}</source>
                        <target>${maven.compiler.target}</target>
                    </configuration>

                </plugin>
                <plugin>
                    <artifactId>maven-surefire-plugin</artifactId>
                    <version>3.0.0-M6</version>
                </plugin>
                <plugin>
                    <artifactId>maven-jar-plugin</artifactId>
                    <version>3.2.2</version>
                </plugin>

                <plugin>
                    <artifactId>maven-install-plugin</artifactId>
                    <version>3.0.0-M1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-deploy-plugin</artifactId>
                    <version>3.0.0-M2</version>
                </plugin>
                <!-- site lifecycle, see https://maven.apache.org/ref/current/maven-core/lifecycles.html#site_Lifecycle -->
                <plugin>
                    <artifactId>maven-site-plugin</artifactId>
                    <version>4.0.0-M1</version>
                </plugin>
                <plugin>
                    <artifactId>maven-project-info-reports-plugin</artifactId>
                    <version>3.3.0</version>
                </plugin>

                <!-- Individuelle Plugins für lokalen NEXUS -->
                <plugin>
                    <groupId>org.sonatype.plugins</groupId>
                    <artifactId>nexus-staging-maven-plugin</artifactId>
                    <version>1.6.13</version>
                    <executions>
                        <execution>
                            <id>default-deploy</id>
                            <phase>deploy</phase>
                            <goals>
                                <goal>deploy</goal>
                            </goals>
                        </execution>
                    </executions>
                    <configuration>
                        <serverId>nexus</serverId>
                        <nexusUrl>http://192.168.177.69:8081</nexusUrl>
                        <skipStaging>true</skipStaging>
                    </configuration>
                </plugin>

            </plugins>

        </pluginManagement>
    </build>
    <dependencies>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.11.0</version>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>javax.enterprise</groupId>
            <artifactId>cdi-api</artifactId>
            <version>1.2</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.faces</groupId>
            <artifactId>javax.faces-api</artifactId>
            <version>2.2</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.glassfish</groupId>
            <artifactId>javax.faces</artifactId>
            <version>2.2.20</version>
            <scope>${faces.impl.scope}</scope>
        </dependency>
        <dependency>
            <groupId>com.liferay.faces</groupId>
            <artifactId>com.liferay.faces.bridge.ext</artifactId>
            <version>6.1.1</version>
            <scope>${war.dependency.scope}</scope>
        </dependency>
        <dependency>
            <groupId>com.liferay.faces</groupId>
            <artifactId>com.liferay.faces.bridge.impl</artifactId>
            <version>4.3.0</version>
            <scope>${war.dependency.scope}</scope>
        </dependency>
        <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
            <scope>${war.dependency.scope}</scope>
        </dependency>
        <dependency>
            <groupId>org.primefaces</groupId>
            <artifactId>primefaces</artifactId>
            <version>11.0.0</version>
            <scope>${war.dependency.scope}</scope>
        </dependency>

        <dependency>
            <groupId>net.mycontent</groupId>
            <artifactId>testdependency</artifactId>
            <version>0.0.1</version>
        </dependency>

    </dependencies>
</project>

This is the exception that i get when i deploy my portlet:

java.lang.NoClassDefFoundError: net.mycontent.testdependency.App
    at com.mycompany.backing.MyBacking.verbindeZuDB(MyBacking.java:52)
    at com.mycompany.backing.MyBacking.getGreeting(MyBacking.java:25)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at javax.el.BeanELResolver.getValue(BeanELResolver.java:321)
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
    at com.sun.el.parser.AstValue.getValue(AstValue.java:139)
    at com.sun.el.parser.AstValue.getValue(AstValue.java:203)
    at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:226)
    at org.jboss.weld.module.web.el.WeldValueExpression.getValue(WeldValueExpression.java:50)
    at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
    at javax.faces.component.UIOutput.getValue(UIOutput.java:174)
    at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:205)
    at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:355)
    at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:164)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
    at org.primefaces.renderkit.CoreRenderer.renderChild(CoreRenderer.java:85)
    at org.primefaces.renderkit.CoreRenderer.renderChildren(CoreRenderer.java:67)
    at org.primefaces.component.panel.PanelRenderer.encodeContent(PanelRenderer.java:219)
    at org.primefaces.component.panel.PanelRenderer.encodeMarkup(PanelRenderer.java:132)
    at org.primefaces.component.panel.PanelRenderer.encodeEnd(PanelRenderer.java:68)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:920)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:456)
    at javax.faces.view.ViewDeclarationLanguageWrapper.renderView(ViewDeclarationLanguageWrapper.java:146)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:134)
    at com.liferay.faces.bridge.application.internal.ViewHandlerCompatImpl.renderView(ViewHandlerCompatImpl.java:93)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
    at com.liferay.faces.bridge.internal.BridgePhaseHeaderRenderCommon.executeRender(BridgePhaseHeaderRenderCommon.java:253)
    at com.liferay.faces.bridge.internal.BridgePhaseRenderCompatImpl.execute(BridgePhaseRenderCompatImpl.java:57)
    at com.liferay.faces.bridge.internal.BridgePhaseRenderImpl.execute(BridgePhaseRenderImpl.java:57)
    at com.liferay.faces.bridge.internal.BridgeImpl.doFacesRequest(BridgeImpl.java:157)
    at javax.portlet.faces.GenericFacesPortlet.doView(GenericFacesPortlet.java:802)
    at javax.portlet.GenericPortlet.doDispatch(GenericPortlet.java:397)
    at javax.portlet.faces.GenericFacesPortlet.doDispatch(GenericFacesPortlet.java:718)
    at javax.portlet.GenericPortlet.render(GenericPortlet.java:291)
    at org.jboss.weldx.portlet.faces.GenericFacesPortlet$Proxy$_$$_WeldClientProxy.render(Unknown Source)
    at jdk.internal.reflect.GeneratedMethodAccessor699.invoke(Unknown Source)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:566)
    at com.liferay.bean.portlet.cdi.extension.internal.CDIBeanPortletMethod.invoke(CDIBeanPortletMethod.java:58)
    at com.liferay.bean.portlet.cdi.extension.internal.CDIBeanPortletExtension._invokeBeanPortletMethod(CDIBeanPortletExtension.java:542)
    at com.liferay.bean.portlet.cdi.extension.internal.CDIBeanPortletExtension.access$000(CDIBeanPortletExtension.java:113)
    at com.liferay.bean.portlet.cdi.extension.internal.CDIBeanPortletExtension$3._invokePortletBeanMethods(CDIBeanPortletExtension.java:370)
    at com.liferay.bean.portlet.cdi.extension.internal.CDIBeanPortletExtension$3.lambda$invokeWithActiveScopes$1(CDIBeanPortletExtension.java:355)
    at com.liferay.bean.portlet.cdi.extension.internal.scope.ScopedBeanManagerThreadLocal.invokeWithScopedBeanManager(ScopedBeanManagerThreadLocal.java:78)
    at com.liferay.bean.portlet.cdi.extension.internal.CDIBeanPortletExtension$3.invokeWithActiveScopes(CDIBeanPortletExtension.java:352)
    at com.liferay.bean.portlet.registration.internal.BeanPortletInvokerPortlet._invokeMethodWithActiveScopes(BeanPortletInvokerPortlet.java:256)
    at com.liferay.bean.portlet.registration.internal.BeanPortletInvokerPortlet.render(BeanPortletInvokerPortlet.java:193)
    at com.liferay.portlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:127)
    at com.liferay.portlet.ScriptDataPortletFilter.doFilter(ScriptDataPortletFilter.java:58)
    at com.liferay.portlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:124)
    at com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:71)
    at com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:113)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:764)
    at org.eclipse.equinox.http.servlet.internal.registration.EndpointRegistration.service(EndpointRegistration.java:153)
    at org.eclipse.equinox.http.servlet.internal.servlet.FilterChainImpl.doFilter(FilterChainImpl.java:50)
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:124)
    at com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:104)
    at com.liferay.portal.osgi.web.wab.extender.internal.adapter.FilterExceptionAdapter.doFilter(FilterExceptionAdapter.java:46)
    at org.eclipse.equinox.http.servlet.internal.registration.FilterRegistration.doFilter(FilterRegistration.java:121)
    at org.eclipse.equinox.http.servlet.internal.servlet.FilterChainImpl.doFilter(FilterChainImpl.java:45)
    at org.eclipse.equinox.http.servlet.internal.servlet.ResponseStateHandler.processRequest(ResponseStateHandler.java:70)
    at org.eclipse.equinox.http.servlet.internal.context.DispatchTargets.doDispatch(DispatchTargets.java:120)
    at org.eclipse.equinox.http.servlet.internal.servlet.RequestDispatcherAdaptor.include(RequestDispatcherAdaptor.java:48)
    at com.liferay.portlet.internal.InvokerPortletImpl.invoke(InvokerPortletImpl.java:576)
    at com.liferay.portlet.internal.InvokerPortletImpl.invokeRender(InvokerPortletImpl.java:666)
    at com.liferay.portlet.internal.InvokerPortletImpl.render(InvokerPortletImpl.java:351)
    at com.liferay.portal.monitoring.internal.portlet.MonitoringInvokerPortlet.lambda$render$0(MonitoringInvokerPortlet.java:259)
    at com.liferay.portal.monitoring.internal.portlet.MonitoringInvokerPortlet._render(MonitoringInvokerPortlet.java:363)
    at com.liferay.portal.monitoring.internal.portlet.MonitoringInvokerPortlet.render(MonitoringInvokerPortlet.java:257)

Thank you in advance for any help or suggestion :)