diff --git a/.github/workflows/assemble-java-combined.yml b/.github/workflows/assemble-java-combined.yml
new file mode 100644
index 0000000..8e15833
--- /dev/null
+++ b/.github/workflows/assemble-java-combined.yml
@@ -0,0 +1,86 @@
+name: Assemble combined all-platform jar
+
+# Controls when the action will run. 
+on:
+  # Triggers the workflow on push or pull request events but only for the master branch
+  push:
+    branches: [ combine-workflow ]
+  #pull_request:
+  #  branches: [ master ]
+
+  # Allows you to run this workflow manually from the Actions tab
+  workflow_dispatch:
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+
+  build-linux:
+    uses: ./.github/workflows/build-java-linux.yml
+
+  build-macos:
+    uses: ./.github/workflows/build-java-macos.yml
+    with:
+      cross_build: y
+
+  build-win32:
+    uses: ./.github/workflows/build-java-win32.yml
+
+  assemble:
+    needs: [build-linux, build-macos, build-win32]
+    # The type of runner that the job will run on
+    runs-on: ubuntu-latest
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+
+    - uses: actions/checkout@v3
+
+    - name: Download hdf5-build-linux
+      uses: actions/download-artifact@v3
+      with:
+        name: hdf5-build-linux
+        path: hdf5-build-linux
+
+    - name: Download hdf5-build-macos
+      uses: actions/download-artifact@v3
+      with:
+        name: hdf5-build-macos
+        path: hdf5-build-macos
+
+    - name: Download hdf5-build-win32
+      uses: actions/download-artifact@v3
+      with:
+        name: hdf5-build-win32
+        path: hdf5-build-win32
+
+    - name: Download Java source
+      uses: actions/download-artifact@v3
+      with:
+        name: hdf5-java-source
+        path: java-combined/src/main/java
+
+    - name: List
+      run: |
+        ./releng/prepare_java_project.sh
+        ls -l
+        tree
+
+    # Could build and publish here but for now just provide maven project
+    # For manual build and deploy
+
+    # - name: Set up JDK 17
+    #   uses: actions/setup-java@v3
+    #   with:
+    #     java-version: '17'
+    #     distribution: 'temurin'
+
+    # - name: Build with Maven
+    #   run: mvn --batch-mode clean verify
+    #   working-directory: java-combined
+
+    - name: Upload artifacts
+      uses: actions/upload-artifact@v3
+      with:
+        name: prepared-maven-project
+        path: "java-combined"
+
diff --git a/.github/workflows/build-java-linux.yml b/.github/workflows/build-java-linux.yml
index b0fc937..e90b453 100644
--- a/.github/workflows/build-java-linux.yml
+++ b/.github/workflows/build-java-linux.yml
@@ -12,6 +12,9 @@ on:
   # Allows you to run this workflow manually from the Actions tab
   workflow_dispatch:
 
+  # Reusable workflow
+  workflow_call:
+
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   # This workflow contains a single job called "build"
diff --git a/.github/workflows/build-java-macos.yml b/.github/workflows/build-java-macos.yml
index 29a8fc0..391d4d8 100644
--- a/.github/workflows/build-java-macos.yml
+++ b/.github/workflows/build-java-macos.yml
@@ -22,6 +22,15 @@ on:
         required: false
         default: false
 
+  # Reusable workflow
+  workflow_call:
+    inputs:
+      cross_build:
+        description: 'Cross compile for universal2 (n/y)'
+        required: false
+        default: n
+        type: string
+
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   # This workflow contains a single job called "build"
diff --git a/.github/workflows/build-java-win32.yml b/.github/workflows/build-java-win32.yml
index b246e62..be7a6c3 100644
--- a/.github/workflows/build-java-win32.yml
+++ b/.github/workflows/build-java-win32.yml
@@ -18,6 +18,9 @@ on:
         required: false
         default: false
 
+  # Reusable workflow
+  workflow_call:
+
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
   # This workflow contains a single job called "build"
diff --git a/LICENSE b/LICENSE
deleted file mode 100644
index 961d1f3..0000000
--- a/LICENSE
+++ /dev/null
@@ -1,28 +0,0 @@
-BSD 3-Clause License
-
-Copyright (c) 2023, Diamond Light Source
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are met:
-
-1. Redistributions of source code must retain the above copyright notice, this
-   list of conditions and the following disclaimer.
-
-2. Redistributions in binary form must reproduce the above copyright notice,
-   this list of conditions and the following disclaimer in the documentation
-   and/or other materials provided with the distribution.
-
-3. Neither the name of the copyright holder nor the names of its
-   contributors may be used to endorse or promote products derived from
-   this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
-FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
-OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/LICENSE b/LICENSE
new file mode 120000
index 0000000..2f236e3
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1 @@
+java-combined/src/main/resources/META-INF/LICENSE
\ No newline at end of file
diff --git a/java-combined/.gitignore b/java-combined/.gitignore
new file mode 100644
index 0000000..2f7896d
--- /dev/null
+++ b/java-combined/.gitignore
@@ -0,0 +1 @@
+target/
diff --git a/java-combined/pom.xml b/java-combined/pom.xml
new file mode 100644
index 0000000..cfe589c
--- /dev/null
+++ b/java-combined/pom.xml
@@ -0,0 +1,117 @@
+<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/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>uk.ac.diamond.hdf5</groupId>
+	<artifactId>hdf5-all</artifactId>
+	<version>1.10.10-SNAPSHOT</version>
+	<packaging>bundle</packaging>
+	<organization>
+		<name>Diamond Light Source</name>
+	</organization>
+	<name>HDF5 Java Native Bindings</name>
+	<description>Wrapping of HDF5 Java API containing native libries and several HDF5 plugins</description>
+	<url>https://github.com/DiamondLightSource/dawn-hdf5-build</url>
+	<licenses>
+		<license>
+			<name>BSD 3-Clause License</name>
+			<url>https://opensource.org/license/bsd-3-clause/</url>
+		</license>
+	</licenses>
+	<developers>
+		<developer>
+			<name>Peter Chang</name>
+			<email>peter.chang@diamond.ac.uk</email>
+			<organization>Diamond Light Source</organization>
+			<organizationUrl>https://www.diamond.ac.uk</organizationUrl>
+		</developer>
+	</developers>
+	<scm>
+		<connection>scm:git:git://github.com/DiamondLightSource/dawn-hdf5-build.git</connection>
+		<developerConnection>scm:git:ssh://github.com:DiamondLightSource/dawn-hdf5-build.git</developerConnection>
+		<url>https://github.com/DiamondLightSource/dawn-hdf5-build/tree/main</url>
+	</scm>
+	<properties>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+	</properties>
+	<build>
+		<plugins>
+			<plugin>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.8.1</version>
+				<configuration>
+					<source>1.8</source>
+					<target>1.8</target>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.felix</groupId>
+				<artifactId>maven-bundle-plugin</artifactId>
+				<version>5.1.9</version>
+				<extensions>true</extensions>
+				<configuration>
+					<instructions>
+						<Export-Package>hdf*</Export-Package>
+						<Eclipse-BundleShape>dir</Eclipse-BundleShape>
+						<Bundle-SymbolicName>hdf.hdf5lib</Bundle-SymbolicName>
+						<Bundle-NativeCode>lib/linux-x86_64/libhdf5.so; lib/linux-x86_64/libhdf5_java.so;osname=Linux; processor=x86_64,
+						lib/macosx-x86_64/libhdf5.103.dylib; lib/macosx-x86_64/libhdf5_java.dylib;osname=MacOSX; processor=x86_64,
+						lib/win32-x86_64/hdf5.dll; lib/win32-x86_64/hdf5_java.dll;osname=Win32; processor=x86_64,
+						lib/linux-aarch64/libhdf5.so; lib/linux-aarch64/libhdf5_java.so;osname=Linux; processor=aarch64,
+						lib/macosx-aarch64/libhdf5.103.dylib; lib/macosx-aarch64/libhdf5_java.dylib;osname=MacOSX; processor=aarch64
+						,*</Bundle-NativeCode>
+					</instructions>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-source-plugin</artifactId>
+				<version>3.2.1</version>
+				<executions>
+					<execution>
+						<goals>
+							<goal>jar</goal>
+						</goals>
+					</execution>
+				</executions>
+				<configuration>
+					<excludes>lib/</excludes>
+					<archive>
+						<manifestEntries>
+							<Bundle-Name>${project.name} Source</Bundle-Name>
+							<Bundle-SymbolicName>hdf.hdf5lib.source</Bundle-SymbolicName>
+							<Bundle-Version>${project.version}</Bundle-Version>
+							<Bundle-Vendor>${project.organization.name}</Bundle-Vendor>
+							<Eclipse-SourceBundle>hdf.hdf5lib;version="${project.version}"</Eclipse-SourceBundle>
+						</manifestEntries>
+					</archive>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-javadoc-plugin</artifactId>
+				<version>3.5.0</version>
+				<executions>
+					<execution>
+						<goals>
+							<goal>jar</goal>
+						</goals>
+					</execution>
+				</executions>
+				<configuration>
+					<failOnError>false</failOnError>
+				</configuration>
+			</plugin>
+		</plugins>
+	</build>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.slf4j</groupId>
+			<artifactId>slf4j-api</artifactId>
+			<version>1.7.30</version>
+		</dependency>
+	</dependencies>
+
+
+</project>
diff --git a/java-combined/src/main/resources/META-INF/LICENSE b/java-combined/src/main/resources/META-INF/LICENSE
new file mode 100644
index 0000000..961d1f3
--- /dev/null
+++ b/java-combined/src/main/resources/META-INF/LICENSE
@@ -0,0 +1,28 @@
+BSD 3-Clause License
+
+Copyright (c) 2023, Diamond Light Source
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/releng/build_codecs.sh b/releng/build_codecs.sh
index 2474a54..08cce53 100755
--- a/releng/build_codecs.sh
+++ b/releng/build_codecs.sh
@@ -78,7 +78,9 @@ download_check_extract_pushd() {
         exit 1
       fi
     fi
+    set +e # Allow this to exit with non-zero for win32 strangeness
     tar xzf $DL_TARBALL
+    set -e
   fi
   pushd $DL_SRC
 }
diff --git a/releng/prepare_java_project.sh b/releng/prepare_java_project.sh
new file mode 100755
index 0000000..a673a17
--- /dev/null
+++ b/releng/prepare_java_project.sh
@@ -0,0 +1,32 @@
+#!/usr/bin/env bash
+
+set -e
+
+# Transfom artifacts from platform builds into the structure
+# required for the final bundle/jar.
+
+# Copy native artifacts into Maven resources location
+resources_location=java-combined/src/main/resources
+
+mkdir -pv ${resources_location}/lib/linux-aarch64
+mkdir -pv ${resources_location}/lib/linux-x86_64
+mkdir -pv ${resources_location}/lib/macosx-aarch64
+mkdir -pv ${resources_location}/lib/macosx-x86_64
+mkdir -pv ${resources_location}/lib/win32-x86_64
+
+cp -a hdf5-build-linux/*/linux/aarch64/* ${resources_location}/lib/linux-aarch64
+cp -a hdf5-build-linux/*/linux/x86_64/* ${resources_location}/lib/linux-x86_64
+cp -a hdf5-build-macos/*/macos/arm64/* ${resources_location}/lib/macosx-aarch64
+cp -a hdf5-build-macos/*/macos/x86_64/* ${resources_location}/lib/macosx-x86_64
+cp -a hdf5-build-win32/*/win32/x86_64/* ${resources_location}/lib/win32-x86_64
+
+# Delete original jars
+find ${resources_location}/lib -name *.jar -exec rm -v {} \;
+
+# Delete unrequired files from java souce
+rm java-combined/src/main/java/CMakeLists.txt
+rm java-combined/src/main/java/hdf/CMakeLists.txt
+rm java-combined/src/main/java/hdf/hdf5lib/CMakeLists.txt
+rm java-combined/src/main/java/Makefile.am
+rm java-combined/src/main/java/Makefile.in
+rm -r java-combined/src/main/java/jni