[ERROR] Manifest com.x:atlassian-plugin:1.0.0: The default package '.' is not permitted by the Import-Pack - how to fix it?

Question

JIRA

Hey! Sorry it's in English, please help!
0. How to fix this error?
1. Should I place all dependencies to Import-Package? Only packages, used in my code from this libs
or root packages of dependencies?
2. If last, how to define root packages, should I manually open jar to see it?
Because from errors I see that Import-Package does not correspond to groupId.
3. Do we have only maven way to build the plugin?
4. Why plugin requires additional oracle dependencies, when other java
apps need only jdbc driver?
Such great JIRA for users, but development of plugins is a hell of a lot for me (and other developers, I read).
I spent several nights without any progress and there are no practical examples with dependencies- just fictional 'my-lib*'.
[ERROR] Manifest com.globs.jira.plugin:com.globs.jira.plugin-boss:atlassian-plugin:1.0.0 : The default package '.' is not permitted by the Import-Package syntax.

<?xml version="1.0" encoding="UTF-8"?>
<project...>
 ...
   <packaging>atlassian-plugin</packaging>
   <dependencies>
      <dependency>
         <groupId>com.atlassian.jira</groupId>
         <artifactId>jira-api</artifactId>
         <version>${jira.version}</version>
         <scope>provided</scope>
      </dependency>
      <dependency>
         <groupId>com.oracle</groupId>
         <artifactId>ojdbc6</artifactId>
         <version>${ojdbc6.version}</version>
         <scope>compile</scope>
      </dependency>
      <dependency>
         <groupId>com.oracle</groupId>
         <artifactId>oraclepki</artifactId>
         <version>1.0</version>
         <scope>compile</scope>
      </dependency>
      <dependency>
         <groupId>com.oracle</groupId>
         <artifactId>orai18n</artifactId>
         <version>${orai18n.version}</version>
         <scope>compile</scope>
      </dependency>
      <dependency>
         <groupId>com.oracle.ons</groupId>
         <artifactId>com.springsource.oracle.ons</artifactId>
         <version>${com.springsource.oracle.ons.version}</version>
         <scope>compile</scope>
      </dependency>
      <dependency>
         <groupId>c3p0</groupId>
         <artifactId>c3p0</artifactId>
         <version>${c3p0.version}</version>
         <scope>compile</scope>
      </dependency>
      <dependency>
         <groupId>com.sun.jna</groupId>
         <artifactId>jna</artifactId>
         <version>${jna.version}</version>
         <scope>compile</scope>
      </dependency>
      <dependency>
         <groupId>net.java.dev.jna</groupId>
         <artifactId>jna-platform</artifactId>
         <version>${jna-platform.version}</version>
         <scope>compile</scope>
      </dependency>
      <dependency>
         <groupId>javax.enterprise</groupId>
         <artifactId>cdi-api</artifactId>
         <version>${cdi-api.version}</version>
         <scope>compile</scope>
      </dependency>
      <dependency>
         <groupId>javax.resource</groupId>
         <artifactId>javax.resource-api</artifactId>
         <version>${javax.resource-api.version}</version>
         <scope>compile</scope>
      </dependency>
      <dependency>
         <groupId>org.projectlombok</groupId>
         <artifactId>lombok</artifactId>
         <version>1.18.4</version>
         <scope>provided</scope>
      </dependency>
      <dependency>
         <groupId>junit</groupId>...
      </dependency>
      <dependency>
         <groupId>com.atlassian.plugin</groupId>
         <artifactId>atlassian-spring-scanner-annotation</artifactId>
         <version>${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>${testkit.version}</version>
            <scope>test</scope>
        </dependency>
        -->
      <dependency>
         <groupId>javax.servlet</groupId>
         <artifactId>servlet-api</artifactId>
         <version>2.4</version>
         <scope>provided</scope>
      </dependency>
      <dependency>
         <groupId>javax.xml.bind</groupId>
         <artifactId>jaxb-api</artifactId>
         <version>2.1</version>
         <scope>provided</scope>
      </dependency>
      <dependency>
         <groupId>com.atlassian.plugins.rest</groupId>
         <artifactId>atlassian-rest-common</artifactId>
         <version>1.0.2</version>
         <scope>provided</scope>
      </dependency>
      <dependency>
         <groupId>com.atlassian.sal</groupId>
         <artifactId>sal-api</artifactId>
         <version>2.6.0</version>
         <scope>provided</scope>
      </dependency>
      <dependency>
         <groupId>org.apache.wink</groupId>
         <artifactId>wink-client</artifactId>
         <version>1.1.3-incubating</version>
         <scope>test</scope>
      </dependency>
      <dependency>
         <groupId>org.mockito</groupId>
         <artifactId>mockito-all</artifactId>
         <version>1.8.5</version>
         <scope>test</scope>
      </dependency>
   </dependencies>
   <build>
      <plugins>
         <plugin>
            <groupId>com.atlassian.maven.plugins</groupId>
            <artifactId>maven-jira-plugin</artifactId>
            <version>${amps.version}</version>
            <extensions>true</extensions>
            <configuration>
               <productVersion>${jira.version}</productVersion>
               <productDataVersion>${jira.version}</productDataVersion>               
               <enableQuickReload>true</enableQuickReload>
               <enableFastdev>false</enableFastdev>
               <instructions>
                  <Atlassian-Plugin-Key>${atlassian.plugin.key}</Atlassian-Plugin-Key>
                  <Export-Package>com.x.jira.plugin.y.api,
                          com.sun.security.auth.module,</Export-Package>
                  <Import-Package>org.springframework.osgi.*;resolution:="optional",
                          org.eclipse.gemini.blueprint.*;resolution:="optional",*</Import-Package>
                  <Spring-Context>*</Spring-Context>
               </instructions>
            </configuration>
         </plugin>
         <plugin>
            <groupId>com.atlassian.plugin</groupId>
            <artifactId>atlassian-spring-scanner-maven-plugin</artifactId>
            <version>${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>7.12.0</jira.version>
      <amps.version>6.3.21</amps.version>
      <plugin.testrunner.version>1.2.3</plugin.testrunner.version>
      <atlassian.spring.scanner.version>1.2.13</atlassian.spring.scanner.version>
      <atlassian.plugin.key>${project.groupId}.${project.artifactId}</atlassian.plugin.key>
      <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>
      <postgresql.version>42.2.5.jre7</postgresql.version>
      <mssql-jdbc.version>7.0.0.jre8</mssql-jdbc.version>
      <mysql-connector-java.version>8.0.13</mysql-connector-java.version>
      <commons-lang3.version>3.8.1</commons-lang3.version>
      <javax.resource-api.version>1.7.1</javax.resource-api.version>
      <orai18n.version>11.2.0.3</orai18n.version>
      <com.springsource.oracle.ons.version>10.2.0.2</com.springsource.oracle.ons.version>
      <ojdbc6.version>12.1.0.1-atlassian-hosted</ojdbc6.version>
      <c3p0.version>0.9.1.2</c3p0.version>
      <jna.version>3.0.9</jna.version>
      <jna-platform.version>5.2.0</jna-platform.version>
      <cdi-api.version>2.0</cdi-api.version>
   </properties>
</project>