Error Executing upgrade_db.sh Script - Path 'conf' to properties files does not exist or is not readable

Problem

When executing an upgrade of the Datameer database, the following error and stacktrace is returned:

[datameer@myhost /opt/datameer/current/bin]$ ./upgrade_db.sh 
Java 7 found
Executing upgrade script for Datameer

Detecting Datameer schema version from current database ..
Current database version is: 4.3.0
DeployMode: live
Exception in thread 'main' java.lang.ExceptionInInitializerError
at java.lang.J9VMInternals.ensureError(J9VMInternals.java:167)
at java.lang.J9VMInternals.recordInitializationFailure(J9VMInternals.java:156)
at datameer.dap.common.license.cb.getPreferences(Unknown Source)
at datameer.dap.common.license.v.b(Unknown Source)
at datameer.dap.common.license.v.(Unknown Source)
at datameer.dap.conductor.tool.upgrade.UpgradePreconditions.main(UpgradePreconditions.java:66)
Caused by: datameer.com.google.common.base.VerifyException: Path 'conf' to properties files does not exist or is not readable
at datameer.com.google.common.base.Verify.verify(Verify.java:123)
at datameer.base.DatameerProperties.(DatameerProperties.java:82)
at datameer.base.DatameerProperties.initializeIfNorAlready(DatameerProperties.java:189)
at datameer.base.DatameerProperties.asImmutableMap(DatameerProperties.java:101)
at datameer.base.DatameerProperties.getProperty(DatameerProperties.java:159)
at datameer.dap.common.license.x.c(Unknown Source)
at datameer.dap.common.license.x.d(Unknown Source)
at datameer.dap.common.license.x.(Unknown Source)
at datameer.dap.common.license.cb$_b.(Unknown Source)
... 4 more

Cause

This is caused by executing the upgrade_db.sh script directly within the <INSTALLDIR>/bin directory. 

Solution

To resolve this issue, re-run the upgrade script directly from the <INSTALLDIR> and preface the script with the bin directory:

[datameer@myhost /opt/datameer/current]$ bin/upgrade_db.sh