FULL PRODUCT VERSION :
java version "1.7.0_51"
Java(TM) SE Runtime Environment (build 1.7.0_51-b13)
Java HotSpot(TM) 64-Bit Server VM (build 24.51-b03, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

A DESCRIPTION OF THE PROBLEM :
While trying to do a build to create a Jira plugin, I encountered the following error"

C:\atlastutorial\combobox>atlas-run --product jira --version 6.1
Executing: "C:\Users\AEI9YB\atlassian-plugin-sdk\apache-maven\bin\mvn.bat" com.a
tlassian.maven.plugins:maven-amps-dispatcher-plugin:4.2.18:run -gs C:\Users\AEI9
YB\atlassian-plugin-sdk\apache-maven/conf/settings.xml -Dproduct=jira -Dproduct.
version=6.1
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building combobox
[INFO] task-segment: [com.atlassian.maven.plugins:maven-amps-dispatcher-plugi
n:4.2.18:run]
[INFO] ------------------------------------------------------------------------
[INFO] Preparing amps-dispatcher:run
[INFO] [amps:copy-bundled-dependencies]
[INFO] [dependency:unpack-dependencies]
[INFO] gson-2.2.2-atlassian-1.jar already exists in destination.
[INFO] [amps:compress-resources]
[INFO] Compiling javascript using YUI
[INFO] Nothing to do, C:\atlastutorial\combobox\target\classes\js\combobox-min.j
s is younger than the original
[INFO] Nothing to do, C:\atlastutorial\combobox\target\classes\css\combobox-min.
css is younger than the original
[INFO] Compressing XML files
[INFO] Nothing to do, C:\atlastutorial\combobox\target\classes\atlassian-plugin.
xml is younger than the original
[INFO] [resources:resources]
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources,
i.e. build is platform dependent!
[INFO] Copying 8 resources
[INFO] [amps:filter-plugin-descriptor]
[INFO] [resources:copy-resources {execution: virtual-execution}]
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] [compiler:compile]
[INFO] Compiling 1 source file to C:\atlastutorial\combobox\target\classes
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Compilation failure
Failure executing javac, but could not parse the error:
An exception has occurred in the compiler (1.7.0_51). Please file a bug at the J
ava Developer Connection (http://java.sun.com/webapps/bugreport) after checking
 the Bug Parade for duplicates. Include your program and the following diagnosti
c in your report. Thank you.
java.lang.AssertionError: Missing type variable in where clause K
        at com.sun.tools.javac.util.RichDiagnosticFormatter.unique(RichDiagnosti
cFormatter.java:234)
        at com.sun.tools.javac.util.RichDiagnosticFormatter.access$100(RichDiagn
osticFormatter.java:67)
        at com.sun.tools.javac.util.RichDiagnosticFormatter$RichPrinter.visitTyp
eVar(RichDiagnosticFormatter.java:384)
        at com.sun.tools.javac.util.RichDiagnosticFormatter$RichPrinter.visitTyp
eVar(RichDiagnosticFormatter.java:326)
        at com.sun.tools.javac.code.Type$TypeVar.accept(Type.java:1030)
        at com.sun.tools.javac.code.Printer.visit(Printer.java:131)


ERROR MESSAGES/STACK TRACES THAT OCCUR :
C:\atlastutorial\combobox>atlas-run --product jira --version 6.1
Executing: "C:\Users\AEI9YB\atlassian-plugin-sdk\apache-maven\bin\mvn.bat" com.a
tlassian.maven.plugins:maven-amps-dispatcher-plugin:4.2.18:run -gs C:\Users\AEI9
YB\atlassian-plugin-sdk\apache-maven/conf/settings.xml -Dproduct=jira -Dproduct.
version=6.1
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Building combobox
[INFO] task-segment: [com.atlassian.maven.plugins:maven-amps-dispatcher-plugi
n:4.2.18:run]
[INFO] ------------------------------------------------------------------------
[INFO] Preparing amps-dispatcher:run
[INFO] [amps:copy-bundled-dependencies]
[INFO] [dependency:unpack-dependencies]
[INFO] gson-2.2.2-atlassian-1.jar already exists in destination.
[INFO] [amps:compress-resources]
[INFO] Compiling javascript using YUI
[INFO] Nothing to do, C:\atlastutorial\combobox\target\classes\js\combobox-min.j
s is younger than the original
[INFO] Nothing to do, C:\atlastutorial\combobox\target\classes\css\combobox-min.
css is younger than the original
[INFO] Compressing XML files
[INFO] Nothing to do, C:\atlastutorial\combobox\target\classes\atlassian-plugin.
xml is younger than the original
[INFO] [resources:resources]
[WARNING] Using platform encoding (Cp1252 actually) to copy filtered resources,
i.e. build is platform dependent!
[INFO] Copying 8 resources
[INFO] [amps:filter-plugin-descriptor]
[INFO] [resources:copy-resources {execution: virtual-execution}]
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] [compiler:compile]
[INFO] Compiling 1 source file to C:\atlastutorial\combobox\target\classes
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Compilation failure
Failure executing javac, but could not parse the error:
An exception has occurred in the compiler (1.7.0_51). Please file a bug at the J
ava Developer Connection (http://java.sun.com/webapps/bugreport) after checking
 the Bug Parade for duplicates. Include your program and the following diagnosti
c in your report. Thank you.
java.lang.AssertionError: Missing type variable in where clause K
        at com.sun.tools.javac.util.RichDiagnosticFormatter.unique(RichDiagnosti
cFormatter.java:234)
        at com.sun.tools.javac.util.RichDiagnosticFormatter.access$100(RichDiagn
osticFormatter.java:67)
        at com.sun.tools.javac.util.RichDiagnosticFormatter$RichPrinter.visitTyp
eVar(RichDiagnosticFormatter.java:384)
        at com.sun.tools.javac.util.RichDiagnosticFormatter$RichPrinter.visitTyp
eVar(RichDiagnosticFormatter.java:326)
        at com.sun.tools.javac.code.Type$TypeVar.accept(Type.java:1030)
        at com.sun.tools.javac.code.Printer.visit(Printer.java:131)
        at com.sun.tools.javac.code.Printer.visitTypes(Printer.java:103)
        at com.sun.tools.javac.code.Printer.visitClassType(Printer.java:194)
        at com.sun.tools.javac.util.RichDiagnosticFormatter$RichPrinter.visitCla
ssType(RichDiagnosticFormatter.java:366)
        at com.sun.tools.javac.util.RichDiagnosticFormatter$RichPrinter.visitCla
ssType(RichDiagnosticFormatter.java:326)
        at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:583)
        at com.sun.tools.javac.code.Printer.visit(Printer.java:131)
        at com.sun.tools.javac.code.Printer.className(Printer.java:262)
        at com.sun.tools.javac.util.RichDiagnosticFormatter$RichPrinter.classNam
e(RichDiagnosticFormatter.java:374)
        at com.sun.tools.javac.code.Printer.visitClassType(Printer.java:190)
        at com.sun.tools.javac.util.RichDiagnosticFormatter$RichPrinter.visitCla
ssType(RichDiagnosticFormatter.java:366)
        at com.sun.tools.javac.util.RichDiagnosticFormatter$RichPrinter.visitCla
ssType(RichDiagnosticFormatter.java:326)
        at com.sun.tools.javac.code.Type$ClassType.accept(Type.java:583)
        at com.sun.tools.javac.code.Printer.visit(Printer.java:131)
        at com.sun.tools.javac.util.AbstractDiagnosticFormatter.formatArgument(A
bstractDiagnosticFormatter.java:187)
        at com.sun.tools.javac.util.AbstractDiagnosticFormatter.formatIterable(A
bstractDiagnosticFormatter.java:216)
        at com.sun.tools.javac.util.AbstractDiagnosticFormatter.formatArgument(A
bstractDiagnosticFormatter.java:184)
        at com.sun.tools.javac.util.AbstractDiagnosticFormatter.formatArguments(
AbstractDiagnosticFormatter.java:158)
        at com.sun.tools.javac.util.BasicDiagnosticFormatter.formatMessage(Basic
DiagnosticFormatter.java:111)
        at com.sun.tools.javac.util.BasicDiagnosticFormatter.formatMeta(BasicDia
gnosticFormatter.java:184)
        at com.sun.tools.javac.util.BasicDiagnosticFormatter.formatDiagnostic(Ba
sicDiagnosticFormatter.java:100)
        at com.sun.tools.javac.util.AbstractDiagnosticFormatter.format(AbstractD
iagnosticFormatter.java:114)
        at com.sun.tools.javac.util.RichDiagnosticFormatter.format(RichDiagnosti
cFormatter.java:112)
        at com.sun.tools.javac.util.RichDiagnosticFormatter.format(RichDiagnosti
cFormatter.java:67)
        at com.sun.tools.javac.util.Log.writeDiagnostic(Log.java:434)
        at com.sun.tools.javac.util.Log.report(Log.java:416)
        at com.sun.tools.javac.comp.Resolve.logResolveError(Resolve.java:1828)
        at com.sun.tools.javac.comp.Resolve.access(Resolve.java:1296)
        at com.sun.tools.javac.comp.Resolve.access(Resolve.java:1311)
        at com.sun.tools.javac.comp.Resolve.resolveConstructor(Resolve.java:1584
)
        at com.sun.tools.javac.comp.Attr.visitNewClass(Attr.java:1734)
        at com.sun.tools.javac.tree.JCTree$JCNewClass.accept(JCTree.java:1372)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:431)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:418)
        at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:449)
        at com.sun.tools.javac.comp.Attr.visitVarDef(Attr.java:887)
        at com.sun.tools.javac.tree.JCTree$JCVariableDecl.accept(JCTree.java:725
)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:431)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:418)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:480)
        at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:496)
        at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:918)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:781)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:431)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:418)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:480)
        at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:836)
        at com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:669)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:431)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:418)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:480)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:3250)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:3173)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:3109)
        at com.sun.tools.javac.comp.Attr.attrib(Attr.java:3083)
        at com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:118
4)
        at com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:870)

        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:829)
        at com.sun.tools.javac.main.Main.compile(Main.java:439)
        at com.sun.tools.javac.main.Main.compile(Main.java:353)
        at com.sun.tools.javac.main.Main.compile(Main.java:342)
        at com.sun.tools.javac.main.Main.compile(Main.java:333)
        at com.sun.tools.javac.Main.compile(Main.java:94)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.codehaus.plexus.compiler.javac.JavacCompiler.compileInProcess(Jav
acCompiler.java:420)
        at org.codehaus.plexus.compiler.javac.JavacCompiler.compile(JavacCompile
r.java:141)
        at org.apache.maven.plugin.AbstractCompilerMojo.execute(AbstractCompiler
Mojo.java:493)
        at org.apache.maven.plugin.CompilerMojo.execute(CompilerMojo.java:114)
        at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPlugi
nManager.java:483)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(Defa
ultLifecycleExecutor.java:678)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalWithLi
fecycle(DefaultLifecycleExecutor.java:540)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.forkProjectLifecy
cle(DefaultLifecycleExecutor.java:1168)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.forkLifecycle(Def
aultLifecycleExecutor.java:1009)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoals(Defa
ultLifecycleExecutor.java:627)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeStandalone
Goal(DefaultLifecycleExecutor.java:553)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoal(Defau
ltLifecycleExecutor.java:523)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHan
dleFailures(DefaultLifecycleExecutor.java:371)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegmen
ts(DefaultLifecycleExecutor.java:332)
        at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLi
fecycleExecutor.java:181)
        at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:356)
        at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:137)
        at org.apache.maven.cli.MavenCli.main(MavenCli.java:356)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:606)
        at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
        at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
        at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)

        at org.codehaus.classworlds.Launcher.main(Launcher.java:375)


[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 23 seconds
[INFO] Finished at: Fri Dec 04 10:12:24 CST 2015
[INFO] Final Memory: 82M/313M
[INFO] ------------------------------------------------------------------------

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package com.emdiesels.jira.plugins.combobox;
 
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Comparator;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.SortedSet;
import java.util.TreeSet;
 
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
import org.dom4j.DocumentException;
 
import org.dom4j.io.SAXReader;
import org.xml.sax.InputSource;
 
import com.atlassian.jira.issue.Issue;
import com.atlassian.jira.issue.customfields.converters.SelectConverter;
import com.atlassian.jira.issue.customfields.converters.StringConverter;
import com.atlassian.jira.issue.customfields.impl.SelectCFType;
import com.atlassian.jira.issue.customfields.manager.GenericConfigManager;
import com.atlassian.jira.issue.customfields.manager.OptionsManager;
import com.atlassian.jira.issue.customfields.persistence.CustomFieldValuePersister;
import com.atlassian.jira.issue.fields.rest.json.beans.JiraBaseUrls;
import com.atlassian.jira.issue.fields.CustomField;
import com.atlassian.jira.issue.fields.config.FieldConfig;
import com.atlassian.jira.issue.fields.layout.field.FieldLayoutItem;
import com.atlassian.jira.issue.search.SearchContextImpl;
import com.atlassian.jira.issue.customfields.option.Option;
 
/**
 * This is a very sophisticated SELECT field
 * @author kg
 * @since 02.02.2012
 */
public class ComboboxCFType extends SelectCFType
{
    /**
     * Custom field specific logger
     */
    private static final Logger log = Logger.getLogger(com.emdiesels.jira.plugins.combobox.ComboboxCFType.class);
 
    /**
     * URL to query all items
     */
    public String url;
 
    /**
     * options manager passed in constructor
     */
    private OptionsManager optionsManager;
 
    public ComboboxCFType(final CustomFieldValuePersister customFieldValuePersister,
final OptionsManager optionsManager,
final GenericConfigManager genericConfigManager,
final JiraBaseUrls jiraBaseUrls) {
super(customFieldValuePersister, optionsManager, genericConfigManager, jiraBaseUrls);

        this.optionsManager = optionsManager;
 
        log.setLevel(Level.ALL);
        log.info("Combobox constructor");
    }


    static <K,V extends Comparable> SortedSet<Map.Entry> entriesSortedByValues(Map<K,V> map) {
        SortedSet<Map.Entry> sortedEntries = new TreeSet<Map.Entry>(
            new Comparator<Map.Entry<K,V>>() {
 
 // private String prepare( Object o )
 // {
 // return ((String)o).toLowerCase().replace( 'ä', 'a' )
 // .replace( 'ö', 'o' )
 // .replace( 'ü', 'u' )
// .replace( 'ß', 's' );
// }
                   @Override public int compare(Map.Entry<K,V> e1, Map.Entry<K,V> e2) {
                    return e2.getValue().compareTo(e1.getValue() );
                }
            }
        );
        sortedEntries.addAll(map.entrySet());
        return sortedEntries;
    }

 
    static boolean containsItem( List<Option> optionList, String value )
    {
        if( optionList == null ) return false;
        for( Option option : optionList )
        {
            if( option.getValue().indexOf( value ) != -1 )
                return true;
        }
        return false;
    }

/*
    public SortedSet<Map.Entry> searchItems()
    {
        Properties properties = new Properties();
        File file = new File("/srv/jira-data/plugins/sophisticated_field_plugin.txt");
        try {
            properties.load(new FileInputStream(file));
            this.url = (String) properties.get("url");
        } catch (IOException e) {
            log.error( "Could not read properties file: " + file.getAbsolutePath() );
        }
        log.info("url:" + url);
 
        log.info("calling searchItems");
        Map m = new HashMap();
        try
        {
            SAXReader saxReader = new SAXReader();
            org.dom4j.Document d = saxReader.read( new URL(url) );
 
            log.info(url);
 
            List dataNodes = d.getRootElement().elements("data");
 
            log.info( "dataNodes.length=" + dataNodes.size());
 
            for (Iterator iterator = dataNodes.iterator(); iterator.hasNext();)
            {
                org.dom4j.Element dataNode = (org.dom4j.Element) iterator.next();
 
                org.dom4j.Element idNode = dataNode.element("id");
                org.dom4j.Element nameNode = dataNode.element("name");
 
                String id = idNode.getStringValue();
                String name = nameNode.getStringValue();
 
                m.put(id, name);
            }
        }
        catch (Exception e)
        {
            log.error("searchItems exception");
            log.error(e.getMessage());
            e.printStackTrace();
        }
        return entriesSortedByValues(m);
    }
*/
    public SortedSet<Map.Entry> searchItems()
    {
        Map m = new HashMap();
m.put("BMW", 5);
m.put("Audi", 4);

return entriesSortedByValues(m);
}

    @Override
    public Map getVelocityParameters(Issue issue,
            CustomField field,
            FieldLayoutItem fieldLayoutItem)
    {
        log.info("calling getVelocityParameters");
 
        Map parameters = super.getVelocityParameters(issue, field, fieldLayoutItem);
 
        FieldConfig fieldConfig = null;
        if(issue == null)
        {
            log.info("issue is null");
            fieldConfig = field.getReleventConfig(new SearchContextImpl());
        } else {
            log.info( "issue is not null" );
            log.info( "issue-id:" + issue.getId() );
            fieldConfig = field.getRelevantConfig(issue);
        }
 
        log.info("before search items");
       SortedSet<Map.Entry> set = searchItems();
       log.info("==> " + set.size());
 
        List existingOptions = optionsManager.getOptions(fieldConfig);
        log.info("EXISTING-OPTIONS: " + existingOptions.size() );
        /*
        for( Option option : existingOptions )
        {
            log.info( option.getOptionId() + " ==> " + option.getValue() );
        }
        */
 

        for( Map.Entry el : set )
        {
            String key = el.getKey();
            String val = el.getValue();
 
            String itm = val + " [" + key + "]";
 
            if(containsItem( existingOptions, key ) ) {
                //log.info( itm + " found ==> continue" );
                continue;
            }
            log.warn( itm + " NOT FOUND!!!");
            Option option = optionsManager.createOption(fieldConfig, null, null, itm);
        }

        return parameters;
    }
}
---------- END SOURCE ----------

SUPPORT :
YES