From my understanding and experiance you must not use Annotations on fields and getters within on entity.

@Column(columnDefinition = ...) ignored unless placed by get method. -------------------------------------------------------------------- Key: HHH-6545 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6545 Project: Hibernate Core Issue Type: Bug Components: annotations Environment: Linux omega 2.6.32-33-generic-pae #71-Ubuntu SMP Wed Jul 20 18:46:41 UTC 2011 i686 GNU/Linux Java(TM) SE Runtime Environment (build 1.6.0_26-b03) jboss-as-7.0.0.Final mysql-connector-java-5.1.15.jar mysql-server-5.1 (5.1.41-3ubuntu12.10) Reporter: jee4hire >>>Not working: @Column is placed with variable definition. Column data is created in database as type tinyblob. Thus, @Column(columnDefinition = "blob") is ignored. @Entity public class File implements Serializable { private Long id; @NotNull @Column(columnDefinition = "blob") private byte [] data; @Id @GeneratedValue public Long getId() { return id; } public void setId(Long i) { id = i; } public byte [] getData() { return data; } public void setData(byte [] d) { data = d; } } ############################################################################## >>>Workaround: @Column is placed with get method. Then, column data is created in database as type blob. @Entity public class File implements Serializable { private Long id; private byte [] data; @Id @GeneratedValue public Long getId() { return id; } public void setId(Long i) { id = i; } @NotNull @Column(columnDefinition = "blob") public byte [] getData() { return data; } public void setData(byte [] d) { data = d; } } ############################################################################## Excerpt from: jboss-as-7.0.0.Final/standalone/configuration/standalone.xml <subsystem xmlns="urn:jboss:domain:datasources:1.0"> <datasources> <datasource jndi-name="java:jboss/datasources/MySqlDS" pool-name="MySqlDS" enabled="true" jta="true" use-java-context="true" use-ccm="true"> <connection-url> jdbc:mysql://localhost:3306/jboss </connection-url> <driver> com.mysql </driver> <transaction-isolation> TRANSACTION_READ_COMMITTED </transaction-isolation> <pool> <min-pool-size> 10 </min-pool-size> <max-pool-size> 100 </max-pool-size> <prefill> true </prefill> <use-strict-min> false </use-strict-min> <flush-strategy> FailingConnectionOnly </flush-strategy> </pool> <security> <user-name> ************* </user-name> <password> ************* </password> </security> <statement> <prepared-statement-cache-size> 32 </prepared-statement-cache-size> <share-prepared-statements/> </statement> </datasource> <drivers> <driver name="com.mysql" module="com.mysql"> <xa-datasource-class> com.mysql.jdbc.jdbc2.optional.MysqlXADataSource </xa-datasource-class> </driver> <driver name="h2" module="com.h2database.h2"> <xa-datasource-class> org.h2.jdbcx.JdbcDataSource </xa-datasource-class> </driver> </drivers> </datasources> </subsystem> ############################################################################## war jars: 61504 Defl:N 56482 8% 2011-07-21 10:31 92d0520b WEB-INF/lib/i18nlog-1.0.10.jar 358085 Defl:N 324832 9% 2011-04-04 11:37 8c574f28 WEB-INF/lib/log4j-1.2.12.jar 47399 Defl:N 41460 13% 2011-07-21 10:31 ac044dbb WEB-INF/lib/jboss-logging-3.0.0.Beta5.jar 204093 Defl:N 181695 11% 2011-07-07 12:54 ed9a2ff2 WEB-INF/lib/picketlink-idm-core-1.5.0.Alpha02.jar 55966 Defl:N 44907 20% 2011-07-07 12:54 d81b0cc2 WEB-INF/lib/seam-international-3.0.0.Final.jar 529064 Defl:N 490198 7% 2011-07-18 14:13 cb9a1aec WEB-INF/lib/quartz-2.0.1.jar 1627515 Defl:N 1470306 10% 2011-07-07 12:54 e71d8ef4 WEB-INF/lib/primefaces-3.0.M2.jar 231287 Defl:N 203688 12% 2011-07-21 10:31 76154858 WEB-INF/lib/jboss-marshalling-1.3.0.CR9.jar 2479225 Defl:N 2249049 9% 2011-08-03 07:41 f775e5eb WEB-INF/lib/richfaces-components-ui-4.1.0-20110802.221239-82.jar 543011 Defl:N 456324 16% 2011-07-12 14:02 f915bdef WEB-INF/lib/joda-time-1.6.1.jar 80863 Defl:N 74890 7% 2011-07-21 10:31 1074f519 WEB-INF/lib/jboss-marshalling-river-1.3.0.CR9.jar 153633 Defl:N 139858 9% 2011-07-18 08:58 267a0105 WEB-INF/lib/seam-security-impl-3.0.1-20110624.041853-12.jar 546379 Defl:N 489412 10% 2011-07-21 10:38 7810d5c7 WEB-INF/lib/jboss-common-core-2.2.17.GA.jar 161455 Defl:N 122304 24% 2011-07-12 15:10 55c0bc93 WEB-INF/lib/knowledge-api-5.2.0.Final.jar 1902276 Defl:N 1719856 10% 2011-07-12 15:10 91eaa4f6 WEB-INF/lib/drools-core-5.2.0.Final.jar 15071 Defl:N 12479 17% 2011-04-04 11:31 a1e02acb WEB-INF/lib/jta-1.1.jar 7635 Defl:N 5428 29% 2011-07-21 10:31 ed71d5ec WEB-INF/lib/rhq-pluginAnnotations-3.0.1.jar 897071 Defl:N 858346 4% 2011-07-12 15:16 a1635c95 WEB-INF/lib/antlr-3.3.jar 91540 Defl:N 81205 11% 2011-07-25 08:27 6d5bdd9e WEB-INF/lib/seam-config-xml-3.0.1-20110723.041850-8.jar 443432 Defl:N 420698 5% 2011-05-16 12:02 d108cdd2 WEB-INF/lib/antlr-2.7.6.jar 1674737 Defl:N 1601274 4% 2011-07-07 12:55 b5de0b5f WEB-INF/lib/ecj-3.5.1.jar 10899 Defl:N 7710 29% 2011-07-21 10:31 b580639d WEB-INF/lib/jboss-transaction-api-1.0.1.GA.jar 15808 Defl:N 12066 24% 2011-07-07 12:54 cbb7cd31 WEB-INF/lib/sac-1.3.jar 269014 Defl:N 245020 9% 2011-06-20 14:42 0d19c92a WEB-INF/lib/commons-net-3.0.1.jar 1472606 Defl:N 1320427 10% 2011-07-21 10:31 0084c472 WEB-INF/lib/infinispan-core-5.0.0.CR7.jar 7457 Defl:N 5972 20% 2011-07-18 14:13 cdac3310 WEB-INF/lib/quartz-jboss-2.0.1.jar 713433 Defl:N 657365 8% 2011-07-12 15:10 3e88a598 WEB-INF/lib/mvel2-2.1.0.drools2.jar 12623 Defl:N 10267 19% 2011-07-21 10:38 77d0c4ba WEB-INF/lib/jboss-logging-spi-2.1.0.GA.jar 253950 Defl:N 241386 5% 2011-05-12 11:27 f758d70e WEB-INF/lib/cssparser-0.9.5.jar 1114265 Defl:N 987976 11% 2011-05-12 11:27 57d773f1 WEB-INF/lib/guava-r08.jar 25496 Defl:N 22183 13% 2011-07-14 12:55 1a95d60b WEB-INF/lib/slf4j-api-1.6.1.jar 85262 Defl:N 64318 25% 2011-08-03 07:41 09f14670 WEB-INF/lib/richfaces-components-api-4.1.0-20110802.221059-82.jar 119223 Defl:N 103690 13% 2011-07-18 08:58 fb1581b3 WEB-INF/lib/seam-persistence-3.0.1-20110711.040751-17.jar 148627 Defl:N 138829 7% 2011-07-12 15:16 3e8b388d WEB-INF/lib/stringtemplate-3.2.1.jar 397907 Defl:N 343667 14% 2011-07-07 12:54 7f34b227 WEB-INF/lib/seam-solder-3.0.0.Final.jar 102661 Defl:N 80043 22% 2011-07-07 12:54 b67dd2a4 WEB-INF/lib/hibernate-jpa-2.0-api-1.0.1.Final.jar 2135793 Defl:N 2028099 5% 2011-07-21 10:31 ade69d61 WEB-INF/lib/jgroups-2.12.0.Final.jar 988489 Defl:N 902079 9% 2011-07-12 15:16 22c8db9d WEB-INF/lib/drools-compiler-5.2.0.Final.jar 424253 Defl:N 391533 8% 2011-08-04 07:24 9a1f5dba WEB-INF/lib/richfaces-core-impl-4.1.0-20110803.165959-73.jar 83291 Defl:N 68465 18% 2011-08-03 07:41 d9920651 WEB-INF/lib/seam-servlet-3.0.1-20110803.040537-7.jar 33716 Defl:N 23689 30% 2011-07-18 08:58 3a591eab WEB-INF/lib/seam-security-api-3.0.1-20110624.041806-12.jar 163650 Defl:N 149460 9% 2011-07-12 15:16 e8acd98f WEB-INF/lib/antlr-runtime-3.3.jar 136498 Defl:N 115026 16% 2011-08-04 07:24 010242c6 WEB-INF/lib/richfaces-core-api-4.1.0-20110803.165751-75.jar 608376 Defl:N 554163 9% 2011-07-14 12:55 4bb8e85b WEB-INF/lib/c3p0-0.9.1.1.jar 23055 Defl:N 14694 36% 2011-07-07 12:54 5dfcdff2 WEB-INF/lib/picketlink-idm-spi-1.5.0.Alpha02.jar 27714 Defl:N 18846 32% 2011-07-07 12:54 9718b1ca WEB-INF/lib/picketlink-idm-api-1.5.0.Alpha02.jar 25717 Defl:N 20670 20% 2011-07-07 12:54 8473b909 WEB-INF/lib/picketlink-idm-common-1.5.0.Alpha02.jar