REST plugin throws error "previously initiated loading for a different type with name"

Hi everybody,

I write my first JIRA Rest service. I want to be able to read and edit personal user properties (no method in default REST API).
My Rest works fine until I activate opensymphony PropertySet in my code.
Without PropertySet I see my “test” JSON data with GET.

After activating PorpertySet in my code I get the following stack trace:

<status>
<status-code>500</status-code>
<message>loader constraint violation: loader (instance of org/apache/felix/framework/BundleWiringImpl$BundleClassLoader) previously initiated loading for a different type with name "com/opensymphony/module/propertyset/PropertySet"</message>
<stack-trace>java.lang.LinkageError: loader constraint violation: loader (instance of org/apache/felix/framework/BundleWiringImpl$BundleClassLoader) previously initiated loading for a different type with name "com/opensymphony/module/propertyset/PropertySet" at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.defineClass(BundleWiringImpl.java:2410) at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.findClass(BundleWiringImpl.java:2194) at org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1607) at org.apache.felix.framework.BundleWiringImpl.access$200(BundleWiringImpl.java:80) at org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:2053) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at de.baywa.jira.rest.UserAttributeRest.getAttributes(UserAttributeRest.java:86) 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 com.atlassian.plugins.rest.common.interceptor.impl.DispatchProviderHelper$ResponseOutInvoker$1.invoke(DispatchProviderHelper.java:192) at com.atlassian.plugins.rest.common.interceptor.impl.DispatchProviderHelper$1.intercept(DispatchProviderHelper.java:83) at com.atlassian.plugins.rest.common.interceptor.impl.DefaultMethodInvocation.invoke(DefaultMethodInvocation.java:53) at com.atlassian.plugins.rest.common.expand.interceptor.ExpandInterceptor.intercept(ExpandInterceptor.java:41) at com.atlassian.plugins.rest.common.interceptor.impl.DefaultMethodInvocation.invoke(DefaultMethodInvocation.java:53) at com.atlassian.plugins.rest.common.interceptor.impl.DispatchProviderHelper.invokeMethodWithInterceptors(DispatchProviderHelper.java:110) at com.atlassian.plugins.rest.common.interceptor.impl.DispatchProviderHelper$ResponseOutInvoker._dispatch(DispatchProviderHelper.java:190) at com.sun.jersey.server.impl.model.method.dispatch.ResourceJavaMethodDispatcher.dispatch(ResourceJavaMethodDispatcher.java:75) at com.sun.jersey.server.impl.uri.rules.HttpMethodRule.accept(HttpMethodRule.java:302) at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) at com.sun.jersey.server.impl.uri.rules.ResourceClassRule.accept(ResourceClassRule.java:108) at com.sun.jersey.server.impl.uri.rules.RightHandPathRule.accept(RightHandPathRule.java:147) at com.sun.jersey.server.impl.uri.rules.RootResourceClassesRule.accept(RootResourceClassesRule.java:84) at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1542) at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest(WebApplicationImpl.java:1473) at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1419) at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest(WebApplicationImpl.java:1409) at com.sun.jersey.spi.container.servlet.WebComponent.service(WebComponent.java:409) at com.sun.jersey.spi.container.servlet.ServletContainer.service(ServletContainer.java:558) at com.atlassian.plugins.rest.module.RestDelegatingServletFilter$JerseyOsgiServletContainer.doFilter(RestDelegatingServletFilter.java:159) at com.sun.jersey.spi.container.servlet.ServletContainer.doFilter(ServletContainer.java:829) at com.atlassian.plugins.rest.module.RestDelegatingServletFilter.doFilter(RestDelegatingServletFilter.java:69) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:55) at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContainerFilter.java:43) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.plugins.rest.module.servlet.RestServletUtilsUpdaterFilter.doFilterInternal(RestServletUtilsUpdaterFilter.java:22) at com.atlassian.plugins.rest.module.servlet.RestServletUtilsUpdaterFilter.doFilter(RestServletUtilsUpdaterFilter.java:34) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.applinks.core.rest.context.ContextFilter.doFilter(ContextFilter.java:24) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.mywork.client.filter.ServingRequestsFilter.doFilter(ServingRequestsFilter.java:32) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.jira.plugin.mobile.web.filter.MobileAppRequestFilter.doFilter(MobileAppRequestFilter.java:59) at com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.jira.plugin.mobile.login.MobileLoginSuccessFilter.doFilter(MobileLoginSuccessFilter.java:54) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.diagnostics.internal.platform.monitor.http.HttpRequestMonitoringFilter.doFilter(HttpRequestMonitoringFilter.java:55) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.analytics.client.filter.UniversalAnalyticsFilter.doFilter(UniversalAnalyticsFilter.java:75) at com.atlassian.analytics.client.filter.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:33) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.web.servlet.plugin.request.RedirectInterceptingFilter.doFilter(RedirectInterceptingFilter.java:21) at com.atlassian.core.filters.AbstractHttpFilter.doFilter(AbstractHttpFilter.java:32) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.prettyurls.filter.PrettyUrlsSiteMeshFixupFilter.doFilter(PrettyUrlsSiteMeshFixupFilter.java:32) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.prettyurls.filter.PrettyUrlsDispatcherFilter.doFilter(PrettyUrlsDispatcherFilter.java:55) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.prettyurls.filter.PrettyUrlsSiteMeshFilter.doFilter(PrettyUrlsSiteMeshFilter.java:80) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.prettyurls.filter.PrettyUrlsMatcherFilter.doFilter(PrettyUrlsMatcherFilter.java:51) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.labs.botkiller.BotKillerFilter.doFilter(BotKillerFilter.java:35) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.lambda$doFilter$0(DelegatingPluginFilter.java:57) at com.atlassian.labs.httpservice.resource.ResourceFilter.doFilter(ResourceFilter.java:59) at com.atlassian.plugin.servlet.filter.DelegatingPluginFilter.doFilter(DelegatingPluginFilter.java:62) at com.atlassian.plugin.servlet.filter.IteratingFilterChain.doFilter(IteratingFilterChain.java:37) at com.atlassian.plugin.servlet.filter.ServletFilterModuleContainerFilter.doFilter(ServletFilterModuleContain...
</status>

My pom.xml:

<?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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>de.mycompany.jira</groupId>
    <artifactId>JiraRest</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <organization>
        <name>My Company</name>
        <url>https://www.my-company.com/</url>
    </organization>
    <name>JiraRest</name>
    <description>REST Service extension for missing REST functions in api2</description>
    <packaging>atlassian-plugin</packaging>
    <dependencies>
        <dependency>
            <groupId>com.atlassian.jira</groupId>
            <artifactId>jira-api</artifactId>
            <version>${jira.version}</version>
            <scope>provided</scope>
        </dependency>
        <!-- Add dependency on jira-core if you want access to JIRA implementation classes as well as the sanctioned API. -->
        <!-- This is not normally recommended, but may be required eg when migrating a plugin originally developed against JIRA 4.x -->
        <!--
        <dependency>
            <groupId>com.atlassian.jira</groupId>
            <artifactId>jira-core</artifactId>
            <version>${jira.version}</version>
            <scope>provided</scope>
        </dependency>
        -->
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.10</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.atlassian.plugin</groupId>
            <artifactId>atlassian-spring-scanner-annotation</artifactId>
            <version>${atlassian.spring.scanner.version}</version>
            <scope>compile</scope>
        </dependency>
        <dependency>
            <groupId>com.atlassian.plugin</groupId>
            <artifactId>atlassian-spring-scanner-runtime</artifactId>
            <version>${atlassian.spring.scanner.version}</version>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>javax.inject</groupId>
            <artifactId>javax.inject</artifactId>
            <version>1</version>
            <scope>provided</scope>
        </dependency>
        <!-- WIRED TEST RUNNER DEPENDENCIES -->
        <dependency>
            <groupId>com.atlassian.plugins</groupId>
            <artifactId>atlassian-plugins-osgi-testrunner</artifactId>
            <version>${plugin.testrunner.version}</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>javax.ws.rs</groupId>
            <artifactId>jsr311-api</artifactId>
            <version>1.1.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.google.code.gson</groupId>
            <artifactId>gson</artifactId>
            <version>2.2.2-atlassian-1</version>
        </dependency>
        <!-- Uncomment to use TestKit in your project. Details at https://bitbucket.org/atlassian/jira-testkit -->
        <!-- You can read more about TestKit at https://developer.atlassian.com/display/JIRADEV/Plugin+Tutorial+-+Smarter+integration+testing+with+TestKit -->
        <!--
        <dependency>
            <groupId>com.atlassian.jira.tests</groupId>
            <artifactId>jira-testkit-client</artifactId>
            <version>${testkit.version}</version>
            <scope>test</scope>
        </dependency>
        -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>servlet-api</artifactId>
            <version>2.4</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.3.1</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.atlassian.plugins.rest</groupId>
            <artifactId>atlassian-rest-common</artifactId>
            <version>1.0.2</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>com.atlassian.sal</groupId>
            <artifactId>sal-api</artifactId>
            <version>2.6.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.wink</groupId>
            <artifactId>wink-client</artifactId>
            <version>1.4</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.mockito</groupId>
            <artifactId>mockito-all</artifactId>
            <version>1.8.5</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>opensymphony</groupId>
            <artifactId>propertyset</artifactId>
            <version>1.5</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>com.atlassian.maven.plugins</groupId>
                <artifactId>jira-maven-plugin</artifactId>
                <version>${amps.version}</version>
                <extensions>true</extensions>
                <configuration>
                    <productVersion>${jira.version}</productVersion>
                    <productDataVersion>${jira.version}</productDataVersion>
                    <!-- Uncomment to install TestKit backdoor in JIRA. -->
                    <!--
                    <pluginArtifacts>
                        <pluginArtifact>
                            <groupId>com.atlassian.jira.tests</groupId>
                            <artifactId>jira-testkit-plugin</artifactId>
                            <version>${testkit.version}</version>
                        </pluginArtifact>
                    </pluginArtifacts>
                    -->
                    <enableQuickReload>true</enableQuickReload>
                    <!-- See here for an explanation of default instructions: -->
                    <!-- https://developer.atlassian.com/docs/advanced-topics/configuration-of-instructions-in-atlassian-plugins -->
                    <instructions>
                        <Atlassian-Plugin-Key>${atlassian.plugin.key}</Atlassian-Plugin-Key>
                        <!-- Add package to export here -->
                        <Export-Package>de.baywa.jira.api,</Export-Package>
                        <!-- Add package import here -->
                        <Import-Package>org.springframework.osgi.*;resolution:="optional", org.eclipse.gemini.blueprint.*;resolution:="optional", *;version="0";resolution:=optional</Import-Package>
                        <!-- Ensure plugin is spring powered -->
                        <Spring-Context>*</Spring-Context>
                    </instructions>
                </configuration>
            </plugin>
            <plugin>
                <groupId>com.atlassian.plugin</groupId>
                <artifactId>atlassian-spring-scanner-maven-plugin</artifactId>
                <version>${atlassian.spring.scanner.version}</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>atlassian-spring-scanner</goal>
                        </goals>
                        <phase>process-classes</phase>
                    </execution>
                </executions>
                <configuration>
                    <scannedDependencies>
                        <dependency>
                            <groupId>com.atlassian.plugin</groupId>
                            <artifactId>atlassian-spring-scanner-external-jar</artifactId>
                        </dependency>
                    </scannedDependencies>
                    <verbose>false</verbose>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <properties>
        <jira.version>8.10.0</jira.version>
        <amps.version>8.0.2</amps.version>
        <plugin.testrunner.version>2.0.1</plugin.testrunner.version>
        <atlassian.spring.scanner.version>1.2.13</atlassian.spring.scanner.version>
        <!-- This property ensures consistency between the key in atlassian-plugin.xml and the OSGi bundle's key. -->
        <atlassian.plugin.key>${project.groupId}.${project.artifactId}</atlassian.plugin.key>
        <!-- TestKit version 6.x for JIRA 6.x -->
        <testkit.version>6.3.11</testkit.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>
</project>

I used the default atlas-jira… generated pom, only attached opensymphony propertyset.
I tried different scope configurations for this dependency but without effort.

My code (primary module without beans):

package com.mycompany.jira.rest;

import com.atlassian.jira.component.ComponentAccessor;
import com.atlassian.jira.permission.GlobalPermissionKey;
import com.atlassian.jira.security.GlobalPermissionManager;

import com.atlassian.jira.security.JiraAuthenticationContext;
import com.atlassian.jira.user.ApplicationUser;
import com.atlassian.jira.user.UserPropertyManager;
import com.atlassian.jira.user.util.UserManager;
import com.opensymphony.module.propertyset.PropertySet;
import com.mycompany.jira.rest.bean.UserAttributeModel;
import com.mycompany.jira.rest.bean.UserModel;

import javax.ws.rs.*;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import java.util.ArrayList;

/**
 * REST service for user attributes (individual properties)
 * there is no service in default REST api2
 */
@Path("/user")
public class UserAttributeRest {
    private final JiraAuthenticationContext jiraAuthenticationContext = ComponentAccessor.getJiraAuthenticationContext();
    private final GlobalPermissionManager globalPermissionManager = ComponentAccessor.getGlobalPermissionManager();
    private final UserManager userManager = ComponentAccessor.getUserManager();
    private final UserPropertyManager userPropertyManager = ComponentAccessor.getUserPropertyManager();

    /**
     * search tag for individual user attributes
     */
    private static final String PROPERTY_META_TAG = "jira.meta.";

    /**
     * read all attributes for given user key
     * returns data in JSON format
     *
     * @param username
     * @return UserModel
     */
    @GET
    @Path("/attribute")
    @Produces({MediaType.APPLICATION_JSON})
    public Response getAttributes(@QueryParam("username")String username) {
        final ApplicationUser currentUser;
        final ApplicationUser targetUser;
        final PropertySet ps;

        ArrayList psKeys;
        UserModel userModel;
        ArrayList<UserAttributeModel> attributeModels;

        try {
            currentUser = jiraAuthenticationContext.getLoggedInUser();

            // check if user had Admin rights
            if (!globalPermissionManager.hasPermission(GlobalPermissionKey.SYSTEM_ADMIN, currentUser)) {
                return Response.status(Response.Status.FORBIDDEN).build();
            }
        } catch (Exception e) {
            return Response.status(Response.Status.BAD_REQUEST).build();
        }

        // check if user variable and json is set
        if(username == null) {
            // no user set
            return Response.status(Response.Status.NO_CONTENT).build();
        }

        try {
            // get user properties
            targetUser = userManager.getUserByName(username);

            // no user in system found
            if (targetUser == null) {
                return Response.status(Response.Status.NOT_FOUND).build();
            }
        } catch (Exception e) {
            return Response.status(Response.Status.BAD_REQUEST).build();
        }

        // get property set
        ps = userPropertyManager.getPropertySet(targetUser);
        psKeys = (ArrayList) ps.getKeys(UserAttributeRest.PROPERTY_META_TAG);

        // create Response return objects
        userModel = new UserModel(username);
        attributeModels = new ArrayList<>();

...

        // set list of attributes
        userModel.setAttributes(attributeModels);

        //return data
        return Response.ok(userModel).build();
    }
}

When I disbale all PropertySet parts the code works and i get my blank JSON.

I think the problem could be, that the com.opensymphony… is exported to my jar. I didn´t find a way to disable the export.
Opensymphony should be activated by default in JIRA, so I think there is no need to export it a second time.

I hope someone can give me a feedback how I can solve my problem.

Regards
Uli

I was able to solve this problem

It seems that the dependency was marked wrong at first import.
It set the dependency to provided.

After use atlas-clean and recompile the jar was correct and my output was shown.
Also I was able to add the POST function and editing works perfect.

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