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DRAFT KB-XXXX Appian 18.2 fails to deploy on Weblogic with "appianHome cannot be null" error

Symptoms

Installing Appian 18.2 with Weblogic 12.2.1.3 results in an error of the following type:

<Warning> <HTTP> <BEA-101162> <User defined listener com.appiancorp.rdbms.datasource.BusinessDataSourceValidator failed: java.lang.NoClassDefFoundError: Could not initialize class com.appiancorp.suite.SuiteConfiguration. java.lang.NoClassDefFoundError: Could not initialize class com.appiancorp.suite.SuiteConfiguration at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) .

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<Jul 11, 2018 1:40:07,424 PM GMT> <Info> <ServletContext-/suite> <BEA-000000> <Closing Spring root WebApplicationContext> <Jul 11, 2018 1:40:07,450 PM GMT> <Warning> <HTTP> <BEA-101162> <User defined listener com.appiancorp.rdbms.config.PrimaryDataSourceShutdown failed: java.lang.IllegalArgumentException: appianHome cannot be null.. java.lang.IllegalArgumentException: appianHome cannot be null.