Theme Tutorial - Theme Plugin cannot be enabled due to error during startup

[Birgit Matuolis]

Hi,

I am following the SDK tutorial "Writing a Confluence Theme" (https://developer.atlassian.com/confdev/tutorials/writing-a-confluence-theme) and am stuck in step 3, because when I start Confluence via atlas-run, I get an error in the log that the class "com.atlassian.confluence.themes.BasicTheme" cannot be loaded:

com.atlassian.plugin.module.ModuleClassNotFoundException: Couldn't load the class 'com.atlassian.confluence.themes.BasicTheme'. This could mean that you misspelled the name of the class (double check) or that you're using a class in your plugin that you haven't provided bundle instructions for. See https://developer.atlassian.com/x/mQAN for more details on how to fix this.

I am trying to get the custom theme to run out of Eclipse, Confluence itself does start up, but I don't see the theme listed in Configuration -> Look and Feel -> Themes.

Do I need to declare the BasicTheme class somewhere? it shows up in my Eclipse project under Referenced LIbraries > confluence-5.9.1.jar and is correctly referenced in my proiect's atlassian-plugin.xml file.

There is no note in the documentation that I need to do anything to make this class visible.

Can somebody who has successfully gone through this tutorial help me?

My system:

Confluence Version: 5.9.1

Atlassian SDK Version 6.1.0

[TtheB]

You need to add com.atlassian.confluence.themes to the <Import-Package> definition in your pom.

<plugin>
    <groupId>com.atlassian.maven.plugins</groupId>
    <artifactId>maven-confluence-plugin</artifactId>
    <version>${amps.version}</version>
    <extensions>true</extensions>
    <configuration>
        <productVersion>${confluence.version}</productVersion>
        <productDataVersion>${confluence.data.version}</productDataVersion>
        <instructions>
            <Atlassian-Plugin-Key>${project.groupId}.${project.artifactId}</Atlassian-Plugin-Key>
            <Spring-Context>*</Spring-Context>
            <Export-Package />
            <Import-Package>
                com.atlassian.confluence.themes,
                com.atlassian.confluence.plugin.descriptor,
                org.springframework.osgi.*;resolution:="optional",
                org.eclipse.gemini.blueprint.*;resolution:="optional",
                com.atlassian.plugin.osgi.bridge.external,
                *;resolution:=optional
            </Import-Package>
        </instructions>
    </configuration>
</plugin>

[Birgit Matuolis]

Unfortunately not :sad:

[Andrei Cocari]

Hi,

Did you find an answer to this yet?

[Panos]

bump. I am also stuck on this one. 

[Panos]

I made this work by doing the follow workaround: Create an empty class that just extends the above BasicTheme. (I didn't have need for overriding methods). In the atlassian-plugin.xml declare as class newly created class and in the pom import the 

com.atlassian.confluence.*;resolution:="optional"

[TtheB]

You need to add com.atlassian.confluence.themes to the <Import-Package> definition in your pom.

<plugin>
    <groupId>com.atlassian.maven.plugins</groupId>
    <artifactId>maven-confluence-plugin</artifactId>
    <version>${amps.version}</version>
    <extensions>true</extensions>
    <configuration>
        <productVersion>${confluence.version}</productVersion>
        <productDataVersion>${confluence.data.version}</productDataVersion>
        <instructions>
            <Atlassian-Plugin-Key>${project.groupId}.${project.artifactId}</Atlassian-Plugin-Key>
            <Spring-Context>*</Spring-Context>
            <Export-Package />
            <Import-Package>
                com.atlassian.confluence.themes,
                com.atlassian.confluence.plugin.descriptor,
                org.springframework.osgi.*;resolution:="optional",
                org.eclipse.gemini.blueprint.*;resolution:="optional",
                com.atlassian.plugin.osgi.bridge.external,
                *;resolution:=optional
            </Import-Package>
        </instructions>
    </configuration>
</plugin>

[TtheB]

You need to add com.atlassian.confluence.themes to the <Import-Package> definition in your pom.

<plugin>
    <groupId>com.atlassian.maven.plugins</groupId>
    <artifactId>maven-confluence-plugin</artifactId>
    <version>${amps.version}</version>
    <extensions>true</extensions>
    <configuration>
        <productVersion>${confluence.version}</productVersion>
        <productDataVersion>${confluence.data.version}</productDataVersion>
        <instructions>
            <Atlassian-Plugin-Key>${project.groupId}.${project.artifactId}</Atlassian-Plugin-Key>
            <Spring-Context>*</Spring-Context>
            <Export-Package />
            <Import-Package>
                com.atlassian.confluence.themes,
                com.atlassian.confluence.plugin.descriptor,
                org.springframework.osgi.*;resolution:="optional",
                org.eclipse.gemini.blueprint.*;resolution:="optional",
                com.atlassian.plugin.osgi.bridge.external,
                *;resolution:=optional
            </Import-Package>
        </instructions>
    </configuration>
</plugin>

[Birgit Matuolis]

Thanks, I'll try this out when I have time :)

(Sorry, I forgot to reply to your initial answer)