Sometimes, when several builds using report plugin quite frequently. The report plugin may throw below exception:

org.h2.jdbc.JdbcSQLException: The database is read only [90097-159]
     at org.h2.message.DbException.getJdbcSQLException(DbException.java:329)
     at org.h2.message.DbException.get(DbException.java:169)
     at org.h2.message.DbException.get(DbException.java:146)
     at org.h2.message.DbException.get(DbException.java:135)
     at org.h2.engine.Database.checkWritingAllowed(Database.java:1626)
     at org.h2.store.FileStore.checkWritingAllowed(FileStore.java:172)
     at org.h2.store.FileStore.write(FileStore.java:333)
     at org.h2.store.PageStore.writePage(PageStore.java:1295)
     at org.h2.store.PageLog.recover(PageLog.java:296)
     at org.h2.store.PageStore.recover(PageStore.java:1318)
     at org.h2.store.PageStore.openExisting(PageStore.java:349)
     at org.h2.store.PageStore.open(PageStore.java:273)
     at org.h2.engine.Database.getPageStore(Database.java:2049)
     at org.h2.engine.Database.open(Database.java:553)
     at org.h2.engine.Database.openDatabase(Database.java:220)
     at org.h2.engine.Database.(Database.java:215)
     at org.h2.engine.Engine.openSession(Engine.java:56)
     at org.h2.engine.Engine.openSession(Engine.java:159)
     at org.h2.engine.Engine.createSessionAndValidate(Engine.java:138)
     at org.h2.engine.Engine.createSession(Engine.java:121)
     at org.h2.engine.Engine.createSession(Engine.java:28)
     at org.h2.engine.SessionRemote.connectEmbeddedOrServer(SessionRemote.java:285)
     at org.h2.jdbc.JdbcConnection.(JdbcConnection.java:110)
     at org.h2.jdbc.JdbcConnection.(JdbcConnection.java:94)
     at org.h2.Driver.connect(Driver.java:72)
     at java.sql.DriverManager.getConnection(DriverManager.java:582)
     at java.sql.DriverManager.getConnection(DriverManager.java:185)
     at com.pmease.quickbuild.plugin.report.engine.datastore.ConnectionManager.getConnection(ConnectionManager.java:23)
     at com.pmease.quickbuild.plugin.report.engine.datastore.DbStore.getConnection(DbStore.java:344)
     at com.pmease.quickbuild.plugin.report.engine.datastore.DbStore.open(DbStore.java:305)
     at com.pmease.quickbuild.plugin.report.engine.metadata.ReportCategory.getRowsCount(ReportCategory.java:292)
     at