Confluence plugin shows blank page at start

[Illés Ákos]

Hi, I'm new to Atlassian plugin development, and I can't even start developing plugins on Confluence, because when I start my plugin with atlas-run I get a blank page at: localhost:1990/confluence/ . The only things I modified in the pom.xml are the confluence and spring versions and the osgi.javaconfig.version and also I added the atlassian maven repository. I did this, because it wouldn't work with the default setting either.

Please can someone help me with my issue?

Here is my pom.xml:

<?xml version="1.0" encoding="UTF-8"?>

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>com.atlassian.tutorial</groupId>
    <artifactId>myConfluenceMacro</artifactId>
    <version>1.0.0-SNAPSHOT</version>

    <organization>
        <name>Example Company</name>
        <url>http://www.example.com/</url>
    </organization>

    <name>myConfluenceMacro</name>
    <description>This is the com.atlassian.tutorial:myConfluenceMacro plugin for Atlassian Confluence.</description>
    <packaging>atlassian-plugin</packaging>

    <repositories>
        <repository>
            <id>atlassian2</id>
            <name>Atlassian2 Repository</name>
            <url>https://maven.atlassian.com/repository/public</url>
        </repository>

    </repositories>
    <pluginRepositories>
        <pluginRepository>
            <id>atlassian2</id>
            <name>Atlassian2 Repository</name>
            <url>https://maven.atlassian.com/repository/public</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>true</enabled>
            </snapshots>
        </pluginRepository>
    </pluginRepositories>

    <dependencies>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.13.1</version>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.atlassian.confluence</groupId>
            <artifactId>confluence</artifactId>
            <version>${confluence.version}</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>com.atlassian.plugins</groupId>
            <artifactId>atlassian-plugins-osgi-javaconfig</artifactId>
            <version>${osgi.javaconfig.version}</version>
        </dependency>
        <!-- OSGi Java Config dependencies -->
        <dependency>
            <groupId>org.apache.felix</groupId>
            <artifactId>org.apache.felix.framework</artifactId>
            <version>4.0.0</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-beans</artifactId>
            <version>${spring.version}</version>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context</artifactId>
            <version>${spring.version}</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>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>com.atlassian.maven.plugins</groupId>
                <artifactId>confluence-maven-plugin</artifactId>
                <version>${amps.version}</version>
                <extensions>true</extensions>
                <configuration>
                    <productVersion>${confluence.version}</productVersion>
                    <productDataVersion>${confluence.data.version}</productDataVersion>
                    <enableQuickReload>true</enableQuickReload>

                    <!-- See here for an explanation of default instructions: -->
                    <!-- https://developer.atlassian.com/docs/advanced-topics/configuration-of-instructions-in-atlassian-plugins -->
                    <instructions>
                        <Atlassian-Plugin-Key>${atlassian.plugin.key}</Atlassian-Plugin-Key>

                        <!-- Add package to export here -->
                        <Export-Package>
                            com.atlassian.tutorial.api,
                        </Export-Package>

                        <!-- Add package import here -->
                        <Import-Package>
                            org.springframework.osgi.*;resolution:="optional",
                            org.eclipse.gemini.blueprint.*;resolution:="optional",
                            *
                        </Import-Package>

                        <!-- Ensure plugin is spring powered -->
                        <Spring-Context>*</Spring-Context>
                    </instructions>
                </configuration>
            </plugin>
        </plugins>
    </build>

    <properties>
        <confluence.version>8.5.8</confluence.version>
        <confluence.data.version>8.5.8</confluence.data.version>
        <amps.version>8.1.2</amps.version>
        <plugin.testrunner.version>2.0.2</plugin.testrunner.version>
        <osgi.javaconfig.version>0.6.0</osgi.javaconfig.version>
        <spring.version>6.1.6</spring.version>
        <!-- This property ensures consistency between the key in atlassian-plugin.xml and the OSGi bundle's key. -->
        <atlassian.plugin.key>${project.groupId}.${project.artifactId}</atlassian.plugin.key>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
    </properties>

</project>

[Fabio Racobaldo _Herzum_ · Accepted solution]

Hi @Illés Ákos ,

please try to build app with jdk11. If the issue persists please share erro in the atlassian-confluence.log

Fabio

[Illés Ákos]

Hi @Fabio Racobaldo _Herzum_ ,

Thank you for your answer, it appears that the problem was indeed with the jdk I was using. More specifically it had to do with a specific icu4j library, that could not parse my jdk version number, because it had a bigger number than 254 in it. Switching to jdk11 or jdk17 resolved my issue.

Thanks,
Ákos

[Fabio Racobaldo _Herzum_]

@Illés Ákos  I'm happy that it resolved your issue

[Aditya Bali]

I can confirm that upgrading java version resolves this issue. Thanks @Fabio Racobaldo _Herzum_