Confluence plugin tutorial - empty page

java : jdk-8u241
sdk: atlassian-plugin-sdk-8.2.7

<!-- pom.xml -->
<properties>
        <confluence.version>8.3.2</confluence.version>
        <confluence.data.version>8.3.2</confluence.data.version>
<!--        <confluence.version>7.19.11</confluence.version>-->
<!--        <confluence.data.version>7.19.11</confluence.data.version>-->
        <amps.version>8.1.2</amps.version>
        <plugin.testrunner.version>2.0.2</plugin.testrunner.version>
        <osgi.javaconfig.version>0.2.0</osgi.javaconfig.version>
        <spring.version>4.2.5.RELEASE</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>

<confluence.version>7.19.11</confluence.version>
<confluence.data.version>7.19.11</confluence.data.version>

is working.

<confluence.version>8.3.2</confluence.version>
<confluence.data.version>8.3.2</confluence.data.version>

is not working