Not able to generate liquibase changelog - liquibase

Question

I am trying to execute command on my command prompt:
liquibase --driver=com.mysql.jdbc.Driver --classpath=E:\mysqljar\mysql.jar --changeLogFile=E:\1.xml --url="jdbc:mysql://localhost:3306/abc" --username=root --password=root generateChangeLog
But I am getting this error:
Liquibase Update Failed: Empty result set, expected one row
SEVERE 24/9/13 6:29 PM:liquibase: Empty result set, expected one row
liquibase.exception.DatabaseException: Error getting jdbc:mysql://localhost:3306/abc view with liquibase.statement.core.GetViewDefinitionStatement#53330681
at liquibase.snapshot.jvm.JdbcDatabaseSnapshotGenerator.readView(JdbcDatabaseSnapshotGenerator.java:168)
at liquibase.snapshot.jvm.JdbcDatabaseSnapshotGenerator.readViews(JdbcDatabaseSnapshotGenerator.java:304)
at liquibase.snapshot.jvm.JdbcDatabaseSnapshotGenerator.createSnapshot(JdbcDatabaseSnapshotGenerator.java:241)
at liquibase.snapshot.DatabaseSnapshotGeneratorFactory.createSnapshot(DatabaseSnapshotGeneratorFactory.java:69)
at liquibase.diff.Diff.compare(Diff.java:63)
at liquibase.integration.commandline.CommandLineUtils.doGenerateChangeLog(CommandLineUtils.java:145)
at liquibase.integration.commandline.Main.doMigration(Main.java:760)
at liquibase.integration.commandline.Main.main(Main.java:134)
Caused by: liquibase.exception.DatabaseException: Empty result set, expected one row
at liquibase.util.JdbcUtils.requiredSingleResult(JdbcUtils.java:124)
at liquibase.executor.jvm.JdbcExecutor.queryForObject(JdbcExecutor.java:159)
at liquibase.executor.jvm.JdbcExecutor.queryForObject(JdbcExecutor.java:167)
at liquibase.executor.jvm.JdbcExecutor.queryForObject(JdbcExecutor.java:163)
at liquibase.database.AbstractDatabase.getViewDefinition(AbstractDatabase.java:748)
at liquibase.snapshot.jvm.JdbcDatabaseSnapshotGenerator.readView(JdbcDatabaseSnapshotGenerator.java:166)
... 7 more
Could anyone help me to interpret this?

Answer 1

I had the same problem.
My fix:
There needs to be an entry in the database change log lock table; it needs to have id=1, locked=false and the rest of the values set to null.

Answer 2

I'm getting the same error also using MySQL and tried v3.0.0 and 3.0.5 of liquibase. The error was the same when I tried to do a migrate as well as a generateChangeLog.
./liquibase --logLevel=debug --changeLogFile=./db.changelog-test-v0.1.xml --username=abc --password=abc99 --url="jdbc:mysql://localhost:3306/test" migrate
FYI, here is the select statement that it had trouble executing for the 'migrate' command:
select view_definition from information_schema.views where table_name='patient_info' and table_schema='test'
The information_schema.views table is empty.