12.6. Cache Store Troubleshooting

An IOException Unsupported protocol version 48 error when using JdbcStringBasedCacheStore indicates that your data column type is set to VARCHAR, CLOB or something similar instead of the correct type, BLOB or VARBINARY. Despite its name, JdbcStringBasedCacheStore only requires that the keys are strings while the values can be any data type, so that they can be stored in a binary column.