Fix class not found error in Grafana component

components/analytics-mgt/grafana-mgt/io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.api/src/main/java/io/entgra/device/mgt/core/analytics/mgt/grafana/proxy/api/impl/GrafanaAPIProxyServiceImpl.java

@@ -22,11 +22,11 @@ import com.google.gson.JsonObject;
 import io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.api.GrafanaAPIProxyService;
 import io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.api.bean.ErrorResponse;
 import io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.api.exception.RefererNotValid;
+import io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.api.impl.util.GrafanaMgtAPIUtils;
 import io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.api.impl.util.GrafanaRequestHandlerUtil;
 import io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.common.exception.GrafanaManagementException;
 import io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.core.bean.GrafanaPanelIdentifier;
 import io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.core.exception.MaliciousQueryAttempt;
-import io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.core.internal.GrafanaMgtDataHolder;
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import io.entgra.device.mgt.core.device.mgt.common.exceptions.DBConnectionException;
@@ -57,8 +57,8 @@ public class GrafanaAPIProxyServiceImpl implements GrafanaAPIProxyService {
     public Response queryDatasource(JsonObject body, @Context HttpHeaders headers, @Context UriInfo requestUriInfo) {
         try {
             GrafanaPanelIdentifier panelIdentifier = GrafanaRequestHandlerUtil.getPanelIdentifier(headers);
-            GrafanaMgtDataHolder.getInstance().getGrafanaQueryService().
-                    buildSafeQuery(body,  panelIdentifier.getDashboardId(), panelIdentifier.getPanelId(), requestUriInfo.getRequestUri());
+            GrafanaMgtAPIUtils.getGrafanaQueryService().buildSafeQuery(body, panelIdentifier.getDashboardId(),
+                    panelIdentifier.getPanelId(), requestUriInfo.getRequestUri());
             return GrafanaRequestHandlerUtil.proxyPassPostRequest(body, requestUriInfo, panelIdentifier.getOrgId());
         } catch (MaliciousQueryAttempt e) {
             return Response.status(Response.Status.BAD_REQUEST).entity(

components/analytics-mgt/grafana-mgt/io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.api/src/main/java/io/entgra/device/mgt/core/analytics/mgt/grafana/proxy/api/impl/util/GrafanaMgtAPIUtils.java

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2018 - 2023, Entgra (Pvt) Ltd. (http://www.entgra.io) All Rights Reserved.
+ *
+ * Entgra (Pvt) Ltd. licenses this file to you under the Apache License,
+ * Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.api.impl.util;
+
+import io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.core.service.GrafanaQueryService;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.wso2.carbon.context.PrivilegedCarbonContext;
+
+public class GrafanaMgtAPIUtils {
+
+    private static final Log log = LogFactory.getLog(GrafanaMgtAPIUtils.class);
+    private static volatile GrafanaQueryService grafanaQueryService;
+
+    /**
+     * Accessing GrafanaQueryService from OSGI service context
+     * @return GrafanaQueryService instance
+     */
+    public static GrafanaQueryService getGrafanaQueryService() {
+        if (grafanaQueryService == null) {
+            synchronized (GrafanaMgtAPIUtils.class) {
+                if (grafanaQueryService == null) {
+                    PrivilegedCarbonContext ctx = PrivilegedCarbonContext.getThreadLocalCarbonContext();
+                    grafanaQueryService =
+                            (GrafanaQueryService) ctx.getOSGiService(GrafanaQueryService.class, null);
+                    if (grafanaQueryService == null) {
+                        String msg = "Grafana Query service has not initialized.";
+                        log.error(msg);
+                        throw new IllegalStateException(msg);
+                    }
+                }
+            }
+        }
+        return grafanaQueryService;
+    }
+}

components/analytics-mgt/grafana-mgt/io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.core/pom.xml

@@ -88,7 +88,7 @@
                             io.entgra.device.mgt.core.application.mgt.core.*
                         </Import-Package>
                         <Export-Package>
-                            !io.entgra.device.mgt.core.transport.mgt.email.sender.core.internal,
+                            !io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.core.internal,
                             io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.core.*
                         </Export-Package>
                         <Embed-Dependency>

components/analytics-mgt/grafana-mgt/io.entgra.device.mgt.core.analytics.mgt.grafana.proxy.core/src/main/java/io/entgra/device/mgt/core/analytics/mgt/grafana/proxy/core/internal/GrafanaManagementServiceComponent.java

@@ -26,7 +26,6 @@ import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.osgi.framework.BundleContext;
 import org.osgi.service.component.ComponentContext;
-import org.wso2.carbon.context.PrivilegedCarbonContext;
 
 /**
  * @scr.component name="io.entgra.analytics.mgt.grafana.proxy.grafanamanagementservicecomponent" immediate="true"