import com.atlassian.jira.bc.issue.search.SearchService;
import com.atlassian.jira.component.ComponentAccessor;
import com.atlassian.jira.issue.Issue;
import com.atlassian.jira.issue.search.SearchException;
import com.atlassian.jira.security.JiraAuthenticationContext;
import com.atlassian.jira.user.ApplicationUser;
import com.atlassian.jira.web.bean.PagerFilter;
import org.apache.log4j.Logger;


/**
 * Logger
 */
Logger LOGGER = Logger.getLogger(this.getClass());

/**
 * Services
 */
SearchService searchService = ComponentAccessor.getOSGiComponentInstanceOfType(SearchService.class);
JiraAuthenticationContext jiraAuthenticationContext = ComponentAccessor.getJiraAuthenticationContext();

/**
 * Current user
 */
ApplicationUser applicationUser = jiraAuthenticationContext.getLoggedInUser();

/**
 * Validate query
 */
String jql="assignee=currentUser()";
SearchService.ParseResult parseResult = searchService.parseQuery(applicationUser, jql);
if (parseResult.isValid()) {
    try {
        /**
         * Execute the search and get the issues
         */
        List<Issue> issues = searchService.search(applicationUser, parseResult.getQuery(), PagerFilter.getUnlimitedFilter()).getResults();
    }catch (SearchException ex){
        LOGGER.error("Error searching: ",ex);
    }
} else {
    LOGGER.error("Error parsing: " + parseResult.getErrors());