diff --git a/jakarta-activation-build.xml b/jakarta-activation-build.xml
new file mode 100644
index 0000000..6ec532e
--- /dev/null
+++ b/jakarta-activation-build.xml
@@ -0,0 +1,144 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<project name="jakarta.activation-api" default="package" basedir=".">
+
+  <!-- ====================================================================== -->
+  <!-- Build environment properties                                           -->
+  <!-- ====================================================================== -->
+
+  <property name="project.groupId" value="jakarta.activation"/>
+  <property name="project.artifactId" value="jakarta.activation-api"/>
+  <property name="project.version" value="2.1.0"/>
+  
+  <property name="spec.version" value="2.1"/>
+  <property name="activation.version" value="${project.version}"/>
+
+  <property name="compiler.source" value="1.8"/>
+  <property name="compiler.target" value="${compiler.source}"/>
+
+  <property name="build.finalName" value="${project.artifactId}-${project.version}"/>
+  <property name="build.dir" value="target"/>
+  <property name="build.outputDir" value="${build.dir}/classes"/>
+  <property name="build.srcDir" value="src/main/java"/>
+  <property name="build.resourceDir" value="src/main/resources"/>
+
+  <property name="reporting.outputDirectory" value="${build.dir}/site"/>
+
+  <!-- ====================================================================== -->
+  <!-- Cleaning up target                                                     -->
+  <!-- ====================================================================== -->
+
+  <target name="clean" description="Clean the output directory">
+    <delete dir="${build.dir}"/>
+  </target>
+
+  <!-- ====================================================================== -->
+  <!-- Compilation target                                                     -->
+  <!-- ====================================================================== -->
+
+  <target name="compile" description="Compile the code">
+    <mkdir dir="${build.outputDir}"/>
+    <javac destdir="${build.outputDir}" 
+           nowarn="false" 
+           debug="true" 
+           optimize="false" 
+           deprecation="true" 
+           target="${compiler.target}" 
+           verbose="false" 
+           fork="false" 
+           source="${compiler.source}">
+      <src>
+        <pathelement location="${build.srcDir}"/>
+      </src>
+	  <exclude name="**/module-info.java"/>
+    </javac>
+    <javac destdir="${build.outputDir}" 
+           nowarn="false" 
+           debug="true" 
+           optimize="false" 
+           deprecation="true" 
+           target="9" 
+           verbose="false" 
+           fork="false" 
+           source="9">
+      <src>
+        <pathelement location="${build.srcDir}"/>
+      </src>
+	  <include name="**/module-info.java"/>
+    </javac>
+    <copy todir="${build.srcDir}">
+      <fileset dir="${build.outputDir}"/>
+    </copy>
+  </target>
+
+  <!-- ====================================================================== -->
+  <!-- Javadoc target                                                         -->
+  <!-- ====================================================================== -->
+
+  <target name="javadoc" description="Generates the Javadoc of the application">
+    <javadoc sourcepath="${build.srcDir}" 
+             packagenames="*" 
+             destdir="${reporting.outputDirectory}/apidocs" 
+             access="protected" 
+             verbose="false" 
+             encoding="UTF-8" 
+             version="true" 
+             use="true" 
+             author="true" 
+             splitindex="false" 
+             nodeprecated="false" 
+             nodeprecatedlist="false" 
+             notree="false" 
+             noindex="false" 
+             nohelp="false" 
+             nonavbar="false" 
+             serialwarn="false" 
+             charset="UTF-8" 
+             linksource="false" 
+             breakiterator="false" 
+             source="${compiler.source}">
+      <header>&lt;![CDATA[&lt;a href=&quot;https://reload4j.qos.ch&quot;&gt;
+          &lt;img src=&quot;https://reload4j.qos.ch/images/logos/reload4j.jpg&quot; height=&quot;40&quot;/&gt;&lt;/a&gt;]]&gt;</header>
+    </javadoc>
+  </target>
+
+  <!-- ====================================================================== -->
+  <!-- Package target                                                         -->
+  <!-- ====================================================================== -->
+
+  <target name="package" depends="compile" description="Package the application">
+    <jar jarfile="${build.dir}/${build.finalName}.jar" 
+         compress="true" 
+         index="false" 
+         basedir="${build.outputDir}" 
+         excludes="**/package.html">
+      <manifest>
+		<attribute name="Bundle-Description" value="Jakarta Activation API 2.1 Specification"/>
+		<attribute name="Bundle-License" value="http://www.eclipse.org/org/documents/edl-v10.php"/>
+		<attribute name="Bundle-ManifestVersion" value="2"/>
+		<attribute name="Bundle-Name" value="Jakarta Activation API"/>
+		<attribute name="Bundle-SymbolicName" value="jakarta.activation-api"/>
+		<attribute name="Bundle-Version" value="${project.version}"/>
+		<attribute name="DynamicImport-Package" value="org.glassfish.hk2.osgiresourcelocator"/>
+		<attribute name="Export-Package" value="jakarta.activation.spi;uses:=&quot;jakarta.activation&quot;;version=&quot;${project.version}&quot;,jakarta.activation;version=&quot;${project.version}&quot;"/>
+		<attribute name="Extension-Name" value="jakarta.activation"/>
+		<attribute name="Implementation-Title" value="Jakarta Activation API"/>
+		<attribute name="Import-Package" value="jakarta.activation,jakarta.activation.spi"/>
+		<attribute name="JavaPackages-ArtifactId" value="jakarta.activation-api"/>
+		<attribute name="JavaPackages-GroupId" value="jakarta.activation"/>
+		<attribute name="JavaPackages-Version" value="${project.version}"/>
+		<attribute name="Manifest-Version" value="1.0"/>
+		<attribute name="Require-Capability" value="osgi.ee;filter:=&quot;(&amp;(osgi.ee=JavaSE)(version=${compiler.target}))&quot;"/>
+		<attribute name="Specification-Title" value="Jakarta Activation Specification"/>
+		<attribute name="Specification-Version" value="${spec.version}"/>
+      </manifest>
+    </jar>
+  </target>
+
+  <!-- ====================================================================== -->
+  <!-- A dummy target for the package named after the type it creates         -->
+  <!-- ====================================================================== -->
+
+  <target name="jar" depends="package" description="Builds the jar for the application"/>
+
+</project>
diff --git a/jakarta-activation.changes b/jakarta-activation.changes
index acea984..9ecf827 100644
--- a/jakarta-activation.changes
+++ b/jakarta-activation.changes
@@ -1,3 +1,8 @@
+-------------------------------------------------------------------
+Thu Mar  3 14:26:41 UTC 2022 - Fridrich Strba <fstrba@suse.com>
+
+- Rewrite build system to build with ant
+
 -------------------------------------------------------------------
 Wed Dec 15 11:58:19 UTC 2021 - Fridrich Strba <fstrba@suse.com>
 
diff --git a/jakarta-activation.spec b/jakarta-activation.spec
index cd22fd9..94a0591 100644
--- a/jakarta-activation.spec
+++ b/jakarta-activation.spec
@@ -1,7 +1,7 @@
 #
 # spec file for package jakarta-activation
 #
-# Copyright (c) 2021 SUSE LLC
+# Copyright (c) 2022 SUSE LLC
 #
 # All modifications and additions to the file contributed by third parties
 # remain the property of their copyright owners, unless otherwise agreed
@@ -16,6 +16,7 @@
 #
 
 
+%global artifact_name jakarta.activation-api
 Name:           jakarta-activation
 Version:        2.1.0
 Release:        0
@@ -23,10 +24,11 @@ Summary:        Jakarta Activation Specification and Implementation
 License:        BSD-3-Clause
 URL:            https://eclipse-ee4j.github.io/jaf/
 Source0:        https://github.com/eclipse-ee4j/jaf/archive/%{version}/jaf-%{version}.tar.gz
+Source1:        %{name}-build.xml
+BuildRequires:  ant
 BuildRequires:  fdupes
 BuildRequires:  java-devel >= 9
-BuildRequires:  maven-local
-BuildRequires:  mvn(org.apache.felix:maven-bundle-plugin)
+BuildRequires:  javapackages-local
 BuildArch:      noarch
 
 %description
@@ -43,28 +45,39 @@ This package contains javadoc for %{name}.
 
 %prep
 %setup -q -n jaf-%{version}
+cp %{SOURCE1} api/build.xml
 
 %pom_remove_parent api
-%pom_remove_plugin :maven-enforcer-plugin api
-%pom_remove_plugin :build-helper-maven-plugin api
-%pom_remove_plugin :buildnumber-maven-plugin api
 
 %build
 pushd api
-%{mvn_build} -f
+%{ant} package javadoc
 popd
 
 %install
 pushd api
-%mvn_install
+# jars
+mkdir -p %{buildroot}%{_javadir}/%{name}
+cp -a target/%{artifact_name}-%{version}.jar %{buildroot}%{_javadir}/%{name}/%{artifact_name}.jar
+
+#pom
+install -d -m 755 %{buildroot}%{_mavenpomdir}/%{name}
+install -pm 644 pom.xml %{buildroot}%{_mavenpomdir}/%{name}/%{artifact_name}.pom
+%add_maven_depmap %{name}/%{artifact_name}.pom %{name}/%{artifact_name}.jar
+
+# javadoc
+mkdir -p %{buildroot}%{_javadocdir}/%{name}
+cp -a target/site/apidocs/* %{buildroot}%{_javadocdir}/%{name}
 popd
+
 %fdupes -s %{buildroot}%{_javadocdir}
 
 %files -f api/.mfiles
 %doc README.md
 %license LICENSE.md NOTICE.md
 
-%files javadoc -f api/.mfiles-javadoc
+%files javadoc
+%{_javadocdir}/%{name}
 %license LICENSE.md NOTICE.md
 
 %changelog