# Errors when building two SDK examples with maven **URL:** \ **Category:** Module Development\ **Created:** [June 28, 2020, 5:49pm UTC](https://forum.inductiveautomation.com/t/errors-when-building-two-sdk-examples-with-maven/36125 "2020-06-28T17:49:59Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![peter](https://avatars.discourse-cdn.com/v4/letter/p/278dde/32.png) [@peter](https://forum.inductiveautomation.com/u/peter)\ **Post date:** [June 28, 2020, 5:49pm UTC](https://forum.inductiveautomation.com/t/errors-when-building-two-sdk-examples-with-maven/36125/1 "2020-06-28T17:49:59Z")
I just tried to build the SDK example modules. Using a fresh install of Debian 10, I installed Open Java JRE/JDK, Git and Maven. I cloned the ignition SDK examples: > [GitHub - inductiveautomation/ignition-sdk-examples: Ignition SDK Example Projects](https://github.com/inductiveautomation/ignition-sdk-examples.git) and from in the SDK directory I ran: > ./buildAll.sh This all seemed to run smoothly (4000+ lines of messages) except for 2 modules: ([buildmessages.txt](https://forum.inductiveautomation.com/uploads/short-url/knN3Dv7tZ7MdhELbE6aZ9qqHLzK.txt) (543.6 KB) > **report-datasource-common** > > [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project report-datasource-common: Compilation failure: Compilation failure: > [ERROR] Source option 5 is no longer supported. Use 6 or later. > [ERROR] Target option 1.5 is no longer supported. Use 1.6 or later. > **slack-notification-gateway** > > [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.2:compile (default-compile) on project slack-notification-gateway: Compilation failure: Compilation failure: > [ERROR] /home/igndev/Documents/ignition/samples/ignition-sdk-examples/slack-alarm-notification/slack-notification-gateway/src/main/java/com/inductiveautomation/ignition/examples/slack/profile/SlackNotificationProfile.java:[20,23] package com.google.gson does not exist > [ERROR] /home/igndev/Documents/ignition/samples/ignition-sdk-examples/slack-alarm-notification/slack-notification-gateway/src/main/java/com/inductiveautomation/ignition/examples/slack/profile/SlackNotificationProfile.java:[123,13] cannot find symbol > [ERROR] symbol: class JsonObject > [ERROR] location: class com.inductiveautomation.ignition.examples.slack.profile.SlackNotificationProfile > [ERROR] /home/igndev/Documents/ignition/samples/ignition-sdk-examples/slack-alarm-notification/slack-notification-gateway/src/main/java/com/inductiveautomation/ignition/examples/slack/profile/SlackNotificationProfile.java:[123,35] cannot find symbol > [ERROR] symbol: class JsonObject > [ERROR] location: class com.inductiveautomation.ignition.examples.slack.profile.SlackNotificationProfile Based on what I am seeing this is not an error due to using Open Java vs Oracle. But as I have no clue about Java and/or Ignition SDK development, I can't even begin to theorize why these errors occur. ---
**Author:** ![paul-griffith](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/paul-griffith/32/37249_2.png) [@paul-griffith](https://forum.inductiveautomation.com/u/paul-griffith)\ **Post date:** [June 29, 2020, 2:58pm UTC](https://forum.inductiveautomation.com/t/errors-when-building-two-sdk-examples-with-maven/36125/2 "2020-06-29T14:58:29Z")
You’re sure you’re using a Java 11 distribution to run Maven? Can you re-run just the failing examples individually? (`maven build` in their respective directories) ---
**Author:** ![peter](https://avatars.discourse-cdn.com/v4/letter/p/278dde/32.png) [@peter](https://forum.inductiveautomation.com/u/peter)\ **Post date:** [June 29, 2020, 3:56pm UTC](https://forum.inductiveautomation.com/t/errors-when-building-two-sdk-examples-with-maven/36125/3 "2020-06-29T15:56:37Z")
For unrelated reasons I created a fresh install of Debian this morning, and went through the same process as I originally reported. The buildAll failed with the same errors. I went into both of the the failing builds and ran: > mvn package This produced the same results as reported above. FWIW my Java version is: > java -version > openjdk version "11.0.7" 2020-04-14 > OpenJDK Runtime Environment (build 11.0.7+10-post-Debian-3deb10u1) > OpenJDK 64-Bit Server VM (build 11.0.7+10-post-Debian-3deb10u1, mixed mode, sharing) Note that the key error message for the report module is: > [ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project report-datasource-common: Compilation failure: Compilation failure: > [ERROR] Source option 5 is no longer supported. Use 6 or later. > [ERROR] Target option 1.5 is no longer supported. Use 1.6 or later. And for the slack module it is: > [ERROR] /home/igndev/Documents/Ignition/ignition-sdk-examples/slack-alarm-notification/slack-notification-gateway/src/main/java/com/inductiveautomation/ignition/examples/slack/profile/SlackNotificationProfile.java:[20,23] package com.google.gson does not exist Neither of these seem related to the actual Java version per se. (and given that everything else **was** built, IMHO I can't see how the installed Java version is at fault) ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [June 29, 2020, 4:05pm UTC](https://forum.inductiveautomation.com/t/errors-when-building-two-sdk-examples-with-maven/36125/4 "2020-06-29T16:05:17Z")
I think these modules just need some minor updates. ---
**Author:** ![Kevin.Herron](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/kevin.herron/32/7259_2.png) [@Kevin.Herron](https://forum.inductiveautomation.com/u/Kevin.Herron)\ **Post date:** [June 29, 2020, 4:11pm UTC](https://forum.inductiveautomation.com/t/errors-when-building-two-sdk-examples-with-maven/36125/5 "2020-06-29T16:11:28Z")
I just pushed fixes for both modules. ---
**Author:** ![peter](https://avatars.discourse-cdn.com/v4/letter/p/278dde/32.png) [@peter](https://forum.inductiveautomation.com/u/peter)\ **Post date:** [June 29, 2020, 4:21pm UTC](https://forum.inductiveautomation.com/t/errors-when-building-two-sdk-examples-with-maven/36125/6 "2020-06-29T16:21:44Z")
This time I got a clean build. Thanks!