diff --git a/.dockerignore b/.dockerignore
index c74eaf1093..87ec80e5e9 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -58,6 +58,8 @@ build_cross/
 build_make/
 install_make/
 temp_*/
+export/
+export_meta/
 
 # Editor directories and files
 *.user
diff --git a/.gitignore b/.gitignore
index 54694e398c..ab345f00c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -41,8 +41,10 @@ temp_cpp/
 temp_cpp_test/
 temp_dotnet/
 temp_dotnet_test/
+temp_meta_dotnet/
 temp_java/
 temp_java_test/
+temp_meta_java/
 temp_python*
 temp_python*_test/
 temp_archive/
@@ -57,6 +59,7 @@ or-tools.snk
 private-key.gpg
 settings.xml
 export
+export_meta
 
 ortools/bazel-*
 examples/bazel-*
diff --git a/tools/release/amd64.Dockerfile b/tools/release/amd64.Dockerfile
index bc5a5d484b..7f0e7d6d00 100644
--- a/tools/release/amd64.Dockerfile
+++ b/tools/release/amd64.Dockerfile
@@ -54,6 +54,13 @@ RUN dnf -y update \
 && rm -rf /var/cache/dnf
 ENV JAVA_HOME=/usr/lib/jvm/java
 
+# Update maven
+ADD https://dlcdn.apache.org/maven/maven-3/3.9.9/binaries/apache-maven-3.9.9-bin.tar.gz /usr/local
+RUN mkdir -p /usr/local/maven \
+ && tar xzvf /usr/local/apache-maven-3.9.9-bin.tar.gz --strip-components=1 -C /usr/local/maven \
+ && rm /usr/local/apache-maven-3.9.9-bin.tar.gz
+ENV PATH=/usr/local/maven/bin:$PATH
+
 ENV TZ=America/Los_Angeles
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 
@@ -67,9 +74,9 @@ WORKDIR /root
 # use ORTOOLS_GIT_SHA1 to modify the command
 # i.e. avoid docker reusing the cache when new commit is pushed
 ARG ORTOOLS_GIT_BRANCH
-ENV ORTOOLS_GIT_BRANCH ${ORTOOLS_GIT_BRANCH:-main}
+ENV ORTOOLS_GIT_BRANCH=${ORTOOLS_GIT_BRANCH:-main}
 ARG ORTOOLS_GIT_SHA1
-ENV ORTOOLS_GIT_SHA1 ${ORTOOLS_GIT_SHA1:-unknown}
+ENV ORTOOLS_GIT_SHA1=${ORTOOLS_GIT_SHA1:-unknown}
 RUN git clone -b "${ORTOOLS_GIT_BRANCH}" --single-branch https://github.com/google/or-tools \
 && cd or-tools \
 && git reset --hard "${ORTOOLS_GIT_SHA1}"
@@ -79,9 +86,9 @@ FROM devel AS delivery
 WORKDIR /root/or-tools
 
 ARG ORTOOLS_TOKEN
-ENV ORTOOLS_TOKEN ${ORTOOLS_TOKEN}
+ENV ORTOOLS_TOKEN=${ORTOOLS_TOKEN}
 ARG ORTOOLS_DELIVERY
-ENV ORTOOLS_DELIVERY ${ORTOOLS_DELIVERY:-all}
+ENV ORTOOLS_DELIVERY=${ORTOOLS_DELIVERY:-all}
 RUN ./tools/release/build_delivery_linux.sh "${ORTOOLS_DELIVERY}"
 
 # Publish delivery
diff --git a/tools/release/arm64.Dockerfile b/tools/release/arm64.Dockerfile
index 26e12aa9cb..dd4725a4f9 100644
--- a/tools/release/arm64.Dockerfile
+++ b/tools/release/arm64.Dockerfile
@@ -59,6 +59,13 @@ RUN dnf -y update \
 && rm -rf /var/cache/dnf
 ENV JAVA_HOME=/usr/lib/jvm/java
 
+# Update maven
+ADD https://dlcdn.apache.org/maven/maven-3/3.9.9/binaries/apache-maven-3.9.9-bin.tar.gz /usr/local
+RUN mkdir -p /usr/local/maven \
+ && tar xzvf /usr/local/apache-maven-3.9.9-bin.tar.gz --strip-components=1 -C /usr/local/maven \
+ && rm /usr/local/apache-maven-3.9.9-bin.tar.gz
+ENV PATH=/usr/local/maven/bin:$PATH
+
 ENV TZ=America/Los_Angeles
 RUN ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
 
@@ -72,9 +79,9 @@ WORKDIR /root
 # use ORTOOLS_GIT_SHA1 to modify the command
 # i.e. avoid docker reusing the cache when new commit is pushed
 ARG ORTOOLS_GIT_BRANCH
-ENV ORTOOLS_GIT_BRANCH ${ORTOOLS_GIT_BRANCH:-main}
+ENV ORTOOLS_GIT_BRANCH=${ORTOOLS_GIT_BRANCH:-main}
 ARG ORTOOLS_GIT_SHA1
-ENV ORTOOLS_GIT_SHA1 ${ORTOOLS_GIT_SHA1:-unknown}
+ENV ORTOOLS_GIT_SHA1=${ORTOOLS_GIT_SHA1:-unknown}
 RUN git clone -b "${ORTOOLS_GIT_BRANCH}" --single-branch https://github.com/google/or-tools \
 && cd or-tools \
 && git reset --hard "${ORTOOLS_GIT_SHA1}"
@@ -84,9 +91,9 @@ FROM devel AS delivery
 WORKDIR /root/or-tools
 
 ARG ORTOOLS_TOKEN
-ENV ORTOOLS_TOKEN ${ORTOOLS_TOKEN}
+ENV ORTOOLS_TOKEN=${ORTOOLS_TOKEN}
 ARG ORTOOLS_DELIVERY
-ENV ORTOOLS_DELIVERY ${ORTOOLS_DELIVERY:-all}
+ENV ORTOOLS_DELIVERY=${ORTOOLS_DELIVERY:-all}
 RUN ./tools/release/build_delivery_linux.sh "${ORTOOLS_DELIVERY}"
 
 # Publish delivery
diff --git a/tools/release/build_delivery_meta.sh b/tools/release/build_delivery_meta.sh
index c1e28ff528..90693e8fbf 100755
--- a/tools/release/build_delivery_meta.sh
+++ b/tools/release/build_delivery_meta.sh
@@ -30,8 +30,8 @@ ${BOLD}DESCRIPTION${RESET}
 
 ${BOLD}OPTIONS${RESET}
 \t-h --help: display this help text
-\tdotnet: build all .Net packages
-\tjava: build all Java packages
+\tdotnet: build the meta .Net package
+\tjava: build the meta Java package
 \tall: build everything (default)
 
 ${BOLD}EXAMPLES${RESET}
@@ -55,7 +55,7 @@ function assert_defined(){
 
 # .Net build
 function build_dotnet() {
-  if echo "${ORTOOLS_BRANCH} ${ORTOOLS_SHA1}" | cmp --silent "${ROOT_DIR}/export/dotnet_build" -; then
+  if echo "${ORTOOLS_BRANCH} ${ORTOOLS_SHA1}" | cmp --silent "${ROOT_DIR}/export_meta/meta_dotnet_build" -; then
     echo "build .Net up to date!" | tee -a build.log
     return 0
   fi
@@ -75,32 +75,32 @@ function build_dotnet() {
 
   $OPENSSL_PRG aes-256-cbc -iter 42 -pass pass:"$ORTOOLS_TOKEN" \
     -in "${RELEASE_DIR}"/or-tools.snk.enc \
-    -out "${ROOT_DIR}"/export/or-tools.snk -d
-  DOTNET_SNK=export/or-tools.snk
+    -out "${ROOT_DIR}"/export_meta/or-tools.snk -d
+  DOTNET_SNK=export_meta/or-tools.snk
   echo "DONE" | tee -a build.log
 
   # Clean dotnet
   echo -n "Clean .Net..." | tee -a build.log
   cd "${ROOT_DIR}" || exit 2
-  rm -rf "${ROOT_DIR}/temp_dotnet"
+  rm -rf "${ROOT_DIR}/temp_meta_dotnet"
   echo "DONE" | tee -a build.log
 
   echo -n "Build .Net..." | tee -a build.log
-  cmake -S. -Btemp_dotnet -DBUILD_SAMPLES=OFF -DBUILD_EXAMPLES=OFF \
+  cmake -S. -Btemp_meta_dotnet -DBUILD_SAMPLES=OFF -DBUILD_EXAMPLES=OFF \
   -DBUILD_DOTNET=ON -DUSE_DOTNET_462=ON -DUNIVERSAL_DOTNET_PACKAGE=ON
-  cmake --build temp_dotnet -j8 -v
+  cmake --build temp_meta_dotnet -j8 -v
   echo "DONE" | tee -a build.log
-  #cmake --build temp_dotnet --target test
+  #cmake --build temp_meta_dotnet --target test
   #echo "cmake test: DONE" | tee -a build.log
 
   # copy nupkg to export
-  cp temp_dotnet/dotnet/packages/Google.OrTools.9.*nupkg export/
-  echo "${ORTOOLS_BRANCH} ${ORTOOLS_SHA1}" > "${ROOT_DIR}/export/dotnet_build"
+  cp temp_meta_dotnet/dotnet/packages/Google.OrTools.9.*nupkg export_meta/
+  echo "${ORTOOLS_BRANCH} ${ORTOOLS_SHA1}" > "${ROOT_DIR}/export_meta/meta_dotnet_build"
 }
 
 # Java build
 function build_java() {
-  if echo "${ORTOOLS_BRANCH} ${ORTOOLS_SHA1}" | cmp --silent "${ROOT_DIR}/export/java_build" -; then
+  if echo "${ORTOOLS_BRANCH} ${ORTOOLS_SHA1}" | cmp --silent "${ROOT_DIR}/export_meta/meta_java_build" -; then
     echo "build Java up to date!" | tee -a build.log
     return 0
   fi
@@ -147,7 +147,7 @@ function build_java() {
   # Clean java
   echo -n "Clean Java..." | tee -a build.log
   cd "${ROOT_DIR}" || exit 2
-  rm -rf "${ROOT_DIR}/temp_java"
+  rm -rf "${ROOT_DIR}/temp_meta_java"
   echo "DONE" | tee -a build.log
 
   echo -n "Build Java..." | tee -a build.log
@@ -159,22 +159,22 @@ function build_java() {
   fi
 
   # shellcheck disable=SC2086: cmake fail to parse empty string ""
-  cmake -S. -Btemp_java -DBUILD_SAMPLES=OFF -DBUILD_EXAMPLES=OFF \
+  cmake -S. -Btemp_meta_java -DBUILD_SAMPLES=OFF -DBUILD_EXAMPLES=OFF \
  -DBUILD_JAVA=ON -DUNIVERSAL_JAVA_PACKAGE=ON \
  -DSKIP_GPG=OFF ${GPG_EXTRA}
-  cmake --build temp_java -j8 -v
+  cmake --build temp_meta_java -j8 -v
   echo "DONE" | tee -a build.log
-  #cmake --build temp_java --target test
+  #cmake --build temp_meta_java --target test
   #echo "cmake test: DONE" | tee -a build.log
 
   # copy meta jar to export
   #if [ ${PLATFORM} == "aarch64" ]; then
-  #  cp temp_java/java/ortools-linux-aarch64/target/*.jar* export/
+  #  cp temp_meta_java/java/ortools-linux-aarch64/target/*.jar* export_meta/
   #else
-  #  cp temp_java/java/ortools-linux-x86-64/target/*.jar* export/
+  #  cp temp_meta_java/java/ortools-linux-x86-64/target/*.jar* export_meta/
   #fi
-  cp temp_java/java/ortools-java/target/*.jar* export/
-  echo "${ORTOOLS_BRANCH} ${ORTOOLS_SHA1}" > "${ROOT_DIR}/export/java_build"
+  cp temp_meta_java/java/ortools-java/target/*.jar* export_meta/
+  echo "${ORTOOLS_BRANCH} ${ORTOOLS_SHA1}" > "${ROOT_DIR}/export_meta/meta_java_build"
 }
 
 # Cleaning everything
@@ -184,9 +184,9 @@ function reset() {
   cd "${ROOT_DIR}" || exit 2
 
   make clean
-  rm -rf temp_dotnet
-  rm -rf temp_java
-  rm -rf export
+  rm -rf temp_meta_dotnet
+  rm -rf temp_meta_java
+  rm -rf export_meta
   rm -f ./*.gpg
   rm -f ./*.log
   rm -f ./*.whl
@@ -217,7 +217,7 @@ function main() {
   local -r ORTOOLS_SHA1=$(git rev-parse --verify HEAD)
   local -r PLATFORM=$(uname -m)
 
-  mkdir -p "${ROOT_DIR}/export"
+  mkdir -p "${ROOT_DIR}/export_meta"
 
   case ${1} in
     dotnet|java)