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In the most of the cases, in tosca model template there is compatibility in field types. Only two types (java.util.Date and Boolean) are not compatible between Eclipse-Link and Hibernate.

Note about precision in DATETIME (https://mariadb.com/kb/en/datetime/): MariaDB can store microseconds with a precision between 0 and 6. If no microsecond precision is specified, then 0 is used by default.

Code Block

title	JpaExample
collapse	true

@Embeddable
@Data
public class ExampleKey implements Serializable {

    private static final long serialVersionUID = 1L;

    @Column(name = "name", length = 120)
    private String name;

    @Column(name = "version", length = 20)
    private String version;
}

@Entity
@Table(name = "Example")
@Data
public class JpaExample implements Serializable {

    private static final long serialVersionUID = 1L;

    @EmbeddedId
    @VerifyKey
    @NotNull
    private ExampleKey key;

    @Column
    private Boolean primed;

    @Column(name = "timeStamp", precision = 3)
    @Temporal(TemporalType.TIMESTAMP)
    @NotNull
    private Date timeStamp;
}

...

MariaDB [controlloop]> select * from ExampleObjListEc;
+-------------+---------+
| name        | version |
+-------------+---------+
| ExampleList | 1.0.0   |
+-------------+---------+
MariaDB [controlloop]> select * from JpaExampleObjListEc_EXAMPLES;
+-------------+---------+------------+---------------+--------+-----------+
| name        | version | child_name | child_version | primed | timeStamp |
+-------------+---------+------------+---------------+--------+-----------+
| ExampleList | 1.0.0   | example1   | 1.0.0         | NULL   | NULL      |
| ExampleList | 1.0.0   | example2   | 1.0.0         | NULL   | NULL      |
+-------------+---------+------------+---------------+--------+-----------+

...

List of Objects using

...

ElementCollection (hacked)

In this scenario JpaExampleLob class is not entity and neither embeddedOneToMany is not used in tosca model template. The example below shows an alternative to ElementCollection. In this example there is a field names collision.

Code Block

language	java
title	JpaExampleObjMapJpaExampleObjListEc
collapse	true

@Entity
@Table(name = "ExampleObjMapExampleObjListEc")
@Data
public class JpaExampleObjMapJpaExampleObjListEc implements Serializable {

    private static final long serialVersionUID = 1L;

    @EmbeddedId
    @VerifyKey
    @NotNull
    private ExampleKey key;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval = true)@ElementCollection
    @Lob
    private Map<@NotNull String, @NotNull JpaExample> List<@NotNull JpaExampleLob> examples;
}

Representation of the example in YAML of what we could save using JpaExampleObjMap entity.

Code Block

language	yml
title	Example
collapse	true

ExampleObjMap:
  name: ExampleObjMap
  version: 1.0.0
  examples:
    MyKey1:
      name: example1
      version: 1.0.0
     MyKey2:
      name: example2
      version: 1.0.0

Eclipse-Link

Hibernate

MariaDB [controlloop]> SHOW CREATE TABLE JpaExampleObjListEc_EXAMPLES;
+------------------------------MariaDB [controlloop]> describe ExampleObjMap;
+----------+--------------+------+-----+---------+-------+
| Field    | Type         | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+-------+
| Table EXAMPLES    |  longblob      |  YES   |      | Create NULLTable     |       |
|  name      | varchar(120) | NO          |  PRI  |  NULL     |       |
| version             | varchar(20)   | NO    |  PRI  |  NULL     |        |
+----------+--------------+------+-----+---------+-------+

After saving the example:

MariaDB [controlloop]> select * from ExampleObjMap;
+--------------------------+---------------+---------+
| EXAMPLES                 | name          | version |
+--------------------------+---------------+---------+
| .... <binary code> ....  | ExampleObjMap | 1.0.0   |
+--------------------------+---------------+---------+

Removing @Lob Annotation

The keys name and version of the JpaExampleObjMap as the same as JpaExample, so Eclipse-Link creates a wrong ExampleObjMap_Example table.

MariaDB [controlloop]> describe ExampleObjMap;
+---------+--------------+------+-----+---------+-------+
| Field   | Type         | Null | Key | Default | Extra |
+---------+--------------+------+-----+---------+-------+
| name    | varchar(120) | NO   | PRI | NULL    |       |
| version | varchar(20)  | NO   | PRI | NULL    |       |
+---------+--------------+------+-----+---------+-------+

MariaDB [controlloop]> SHOW CREATE TABLE ExampleObjMap_Example;
+-----------------------+-------------------------------------------------------------------------------------------------------------+
| Table                 | Create Table                                                                                                JpaExampleObjListEc_EXAMPLES | CREATE TABLE `JpaExampleObjListEc_EXAMPLES` (
                                   `name` varchar(120) NOT NULL,
                                   `version` varchar(20) NOT NULL,
                                   `examples` longblob DEFAULT NULL,
                                   KEY `FK1a58hldurq1910ne2hbm9a7af` (`name`,`version`),
                                   CONSTRAINT `FK1a58hldurq1910ne2hbm9a7af` FOREIGN KEY (`name`, `version`)
                                              REFERENCES `ExampleObjListEc` (`name`, `version`)
                                 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4                                                              |
+-----------------------+-------+------------------------------------------------------------------------------------------------------+| ExampleObjMap_Example | CREATE TABLE `ExampleObjMap_Example` (
                            `name` varchar(120) NOT NULL,

After saving an example:

MariaDB [controlloop]> select * from JpaExampleObjListEc_EXAMPLES;
+-------------+---------+---------------------------+
| name        | version | examples                  |
+-------------+---------+---------------------------+
| ExampleList | 1.0.0   |         `version` varchar(20) NOT NULL,
                            `EXAMPLES_KEY` varchar(255) DEFAULT NULL,
                            PRIMARY KEY (`name`,`version`),
            .... <binary code> ....  |
| ExampleList | 1.0.0   |  .... <binary code> ....  |
+-------------+---------+---------------------------+

Map of Objects using OneToMany

OneToMany is not used in tosca model template. The example below shows an alternative to ElementCollection. In this example there is a field names collision.

Code Block

language	java
title	JpaExampleObjMap
collapse	true

@Entity
@Table(name = "ExampleObjMap")
@Data
public class JpaExampleObjMap implements Serializable {

    private static final long serialVersionUID = 1L;

    @EmbeddedId
    @VerifyKey
    @NotNull
    private ExampleKey key;

    @OneToMany(fetch = FetchType.EAGER, cascade = CascadeType.ALL, orphanRemoval = true)
    @Lob
    private Map<@NotNull String, @NotNull JpaExample> examples;
}

Representation of the example in YAML of what we could save using JpaExampleObjMap entity.

Code Block

language	yml
title	Example
collapse	true

ExampleObjMap:
  name: ExampleObjMap
  version: 1.0.0
  examples:
    MyKey1:
      name: example1
      version: 1.0.0
     MyKey2:
      name: example2
      version: 1.0.0

Eclipse-Link

MariaDB [controlloop]> describe ExampleObjMap;
+----------+--------------+------+-----+---------+-------+
| Field    | Type         | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+-------+
| EXAMPLES | longblob     | YES  |     | NULL    |       |
| name     | varchar(120) | NO   | PRI | NULL    |       |
| version  | varchar(20)  | NO   | PRI | NULL    |       |
+                 CONSTRAINT `FK_ExampleObjMap_Example_name` FOREIGN KEY (`name`, `version`)
                            REFERENCES `ExampleObjMap` (`name`, `version`)
                          ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4                                                                     |
+-----------------------+--------------+------+-----+---------+-------+

After saving the example:


MariaDB [controlloop]> select * from ExampleObjMap;
+--------------------------+---------------+-----------------+
| EXAMPLES                 | name          | version |
+--------------------------+

Using these tables I have got this error: Cannot add or update a child row: a foreign key constraint fails (`controlloop`.`ExampleObjMap_Example`, CONSTRAINT `FK_ExampleObjMap_Example_name` FOREIGN KEY (`name`, `version`) REFERENCES `ExampleObjMap` (`name`, `version`))
Error Code: 1452

Map of Objects using OneToMany (fixed)

The example below shows an alternative to ElementCollection with the fix to avoid field names collision.

Code Block

language	java
title	JpaExampleObjMap
collapse	true

@Entity
@Table(name = "ExampleObjMap")
@Data
public class JpaExampleObjMap implements Serializable {

    private static final long serialVersionUID = 1L;

    @EmbeddedId
    @VerifyKey
    @NotNull
    private ExampleKey key;

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    @JoinTable(
            joinColumns = {@JoinColumn(name = "parent_name", referencedColumnName = "name"),
                    @JoinColumn(name = "parent_version", referencedColumnName = "version")},
            inverseJoinColumns = {@JoinColumn(name = "child_name", referencedColumnName = "name"),
                    @JoinColumn(name = "child_version", referencedColumnName = "version")})
    private Map<@NotNull String, @NotNull JpaExample> examples;
}

...

---------------+---------+
| .... <binary code> ....  | ExampleObjMap | 1.0.0   |
+--------------------------+---------------+---------+

Removing @Lob Annotation

The keys name and version of the JpaExampleObjMap as the same as JpaExample, so Eclipse-Link creates a wrong ExampleObjMap_Example table.

MariaDB [controlloop]> describe ExampleObjMap;
+---------+--------------+------+-----+---------+-------+
| Field   | Type         | Null | Key | Default | Extra |
+---------+--------------+------+-----+---------+-------+
| name    | varchar(120) | NO   | PRI | NULL    |       |
| version | varchar(20)  | NO   | PRI | NULL    |       |
+---------+--------------+------+-----+---------+-------+


MariaDB [controlloop]> SHOW CREATE TABLE ExampleObjMap_Example;
+-----------------------+-------------------------------------------------------------------------------------------------------------+
| Table                 | Create Table                                                                                                |
+-----------------------+-------------------------------------------------------------------------------------------------------------+
| ExampleObjMap_Example | CREATE TABLE `ExampleObjMap_Example` (
                             `parent_name``name` varchar(120) NOT NULL,
                             `parent_version``version` varchar(20) NOT NULL,
                             `child`EXAMPLES_name`KEY` varchar(120255) NOTDEFAULT NULL,
                             PRIMARY `child_version`KEY varchar(20) NOT NULL`name`,`version`),
                            `EXAMPLES_KEY` varchar(255) DEFAULT NULL,
                            PRIMARY KEY (`parent_name`,`parent_version`,`child_name`,`child_version`),CONSTRAINT `FK_ExampleObjMap_Example_name` FOREIGN KEY (`name`, `version`)
                            KEY `FK_ExampleObjMap_Example_child_name` (`child_name`,`child_version`),
                            CONSTRAINT `FK_ExampleObjMap_Example_child_name` FOREIGN KEY (`child_name`, `child_version` REFERENCES `ExampleObjMap` (`name`, `version`)
                          ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4          REFERENCES `Example` (`name`, `version`),
                            CONSTRAINT `FK_ExampleObjMap_Example_parent_name` FOREIGN KEY (`parent_name`, `parent_version`)
                            REFERENCES `ExampleObjMap` (`name`, `version`)
                          ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4                                                                     |
+------|
+-------------------------+-------------------------------------------------------------------------------------------------------------+

After saving the example:

MariaDB [controlloop]> select * from ExampleObjMap;
+---------------+---------+
| name          | version |
+---------------+---------+
| ExampleObjMap | 1.0.0   |
+---------------+---------+

Using these tables I have got this error: Cannot add or update a child row: a foreign key constraint fails (`controlloop`.`ExampleObjMap_Example`, CONSTRAINT `FK_ExampleObjMap_Example_name` FOREIGN KEY (`name`, `version`) REFERENCES `ExampleObjMap` (`name`, `version`))
Error Code: 1452

Map of Objects using OneToMany (fixed)

The example below shows an alternative to ElementCollection with the fix to avoid field names collision.

Code Block

language	java
title	JpaExampleObjMap
collapse	true

@Entity
@Table(name = "ExampleObjMap")
@Data
public class JpaExampleObjMap implements Serializable {

    private static final long serialVersionUID = 1L;

    @EmbeddedId
    @VerifyKey
    @NotNull
    private ExampleKey key;

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    @JoinTable(
            joinColumns = {@JoinColumn(name = "parent_name", referencedColumnName = "name"),
                    @JoinColumn(name = "parent_version", referencedColumnName = "version")},
            inverseJoinColumns = {@JoinColumn(name = "child_name", referencedColumnName = "name"),
                    @JoinColumn(name = "child_version", referencedColumnName = "version")})
    private Map<@NotNull String, @NotNull JpaExample> examples;
}

Eclipse-Link

MariaDB [controlloop]> SHOW CREATE TABLE ExampleObjMap_Example;
+------MariaDB [controlloop]> select * from Example;
+--------+-----------+----------+---------+
| PRIMED | timeStamp | name     | version |
+--------+-----------+----------+---------+
|   NULL | NULL      | example1 | 1.0.0   |
|   NULL | NULL      | example2 | 1.0.0   |
+--------+-----------+----------+---------+MariaDB [controlloop]> select * from ExampleObjMap_Example;
+---------------+----------------+------------+---------------+--------------+
| parent_name   | parent_version | child_name | child_version | EXAMPLES_KEY |
+---------------+----------------+------------+---------------+--------------+
| ExampleObjMap | 1.0.0+
| Table                 | Create Table                        | example1    | 1.0.0            |  MyKey1        |
|  ExampleObjMap  | 1.0.0             | example2    | 1.0.0            |  MyKey2         |
+---------------+----------------+------------+---------------+--------------+

Hibernate

MariaDB [controlloop]> SHOW CREATE TABLE ExampleObjMap_Example;

+-----------------------+-------------------------------------------------------------------------------------------------------------+
| Table                 | Create Table                                                                                                |
+-----------------------+-------------------------------------------------------------------------------------------------------------+
| ExampleObjMap_Example | CREATE TABLE `ExampleObjMap_Example` (+
| ExampleObjMap_Example | CREATE TABLE `ExampleObjMap_Example` (
                            `parent_name` varchar(120) NOT NULL,
                            `parent_version` varchar(20) NOT NULL,
                            `child_name` varchar(120) NOT NULL,
                            `child_version` varchar(20) NOT NULL,
                            `parent`EXAMPLES_name`KEY` varchar(120255) NOTDEFAULT NULL,
                            PRIMARY KEY (`parent_version` varchar(20) NOT NULLname`,`parent_version`,`child_name`,`child_version`),
                            `child KEY `FK_ExampleObjMap_Example_child_name` varchar(120) NOT NULL(`child_name`,`child_version`),
                            `child_version` varchar(20) NOT NULL,
                            `examples_KEY` varchar(255) NOT NULL,
             CONSTRAINT `FK_ExampleObjMap_Example_child_name` FOREIGN KEY (`child_name`, `child_version`)
               PRIMARY KEY (`parent_name`,`parent_version`,`examples_KEY`),
                            UNIQUE KEY `UK_ma8t20i58tt5ilqjrk2ged242` (`child_name`,`child_version`REFERENCES `Example` (`name`, `version`),
                            CONSTRAINT `FK2n1x5g38x55wejkvnvhqin980``FK_ExampleObjMap_Example_parent_name` FOREIGN KEY (`parent_name`, `parent_version`)
                                       REFERENCES `ExampleObjMap` (`name`, `version`),
                            CONSTRAINT `FKstwyuf69lrj4tjpafwriuwp3h` FOREIGN KEY (`child_name`, `child_version`)
 ENGINE=InnoDB DEFAULT CHARSET=utf8mb4                                    REFERENCES `Example` (`name`, `version`)
                          ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4                                                                     |
+-|
+------------------------------+-------------------------------------------------------------------------------------------------------------+

...

MariaDB [controlloop]> select * from ExampleObjMap;
+---------------+---------+
| name          | version |
+---------------+---------+
| ExampleObjMap | 1.0.0   |
+---------------+---------+

MariaDB [controlloop]> select * from Example;
+--------+--+---------+--------+--+---------+
| namePRIMED  |  timeStamp | versionname |  primed  | timeStampversion |
+--------+--+---------+--------+--+---------+
|   NULL | NULL      | example1 | 1.0.0   |
|   NULL   | NULL      |
| example2 | 1.0.0   | NULL   | NULL      |
+--------+--+---------+--------+--+---------+

MariaDB [controlloop]> select * from ExampleObjMap_Example;
+---------------+----------------+------------+---------------+--------------+
| parent_name   | parent_version | child_name | child_version | examplesEXAMPLES_KEY |
+---------------+----------------+------------+---------------+--------------+
| ExampleObjMap | 1.0.0          | example1   | 1.0.0         | MyKey1       |
| ExampleObjMap | 1.0.0          | example2   | 1.0.0         | MyKey2       |
+---------------+----------------+------------+---------------+--------------+ | 1.0.0          | example1   | 1.0.0         | MyKey1       |
| ExampleObjMap | 1.0.0          | example2   | 1.0.0         | MyKey2       |
+---------------+----------------+------------+---------------+--------------+

Hibernate

MariaDB [controlloop]> SHOW CREATE TABLE ExampleObjMap_Example;

+-----------------------+-------------------------------------------------------------------------------------------------------------+
| Table                 | Create Table                                                                                                |
+-----------------------+-------------------------------------------------------------------------------------------------------------+
| ExampleObjMap_Example | CREATE TABLE `ExampleObjMap_Example` (
                            `parent_name` varchar(120) NOT NULL,
                            `parent_version` varchar(20) NOT NULL,
                            `child_name` varchar(120) NOT NULL,
                            `child_version` varchar(20) NOT NULL,
                            `examples_KEY` varchar(255) NOT NULL,
                            PRIMARY KEY (`parent_name`,`parent_version`,`examples_KEY`),
                            UNIQUE KEY `UK_ma8t20i58tt5ilqjrk2ged242` (`child_name`,`child_version`),
                            CONSTRAINT `FK2n1x5g38x55wejkvnvhqin980` FOREIGN KEY (`parent_name`, `parent_version`)
                                       REFERENCES `ExampleObjMap` (`name`, `version`),
                            CONSTRAINT `FKstwyuf69lrj4tjpafwriuwp3h` FOREIGN KEY (`child_name`, `child_version`)
                                       REFERENCES `Example` (`name`, `version`)
                          ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4                                                                     |
+-----------------------+-------------------------------------------------------------------------------------------------------------+

After saving the example:

MariaDB [controlloop]> select * from ExampleObjMap;
+---------------+---------+
| name          | version |
+---------------+---------+
| ExampleObjMap | 1.0.0   |
+---------------+---------+

MariaDB [controlloop]> select * from Example;
+----------+---------+--------+-----------+
| name     | version | primed | timeStamp |
+----------+---------+--------+-----------+
| example1 | 1.0.0   | NULL   | NULL      |
| example2 | 1.0.0   | NULL   | NULL      |
+----------+---------+--------+-----------+

MariaDB [controlloop]> select * from ExampleObjMap_Example;
+---------------+----------------+------------+---------------+--------------+
| parent_name   | parent_version | child_name | child_version | examples_KEY |
+---------------+----------------+------------+---------------+--------------+
| ExampleObjMap | 1.0.0          | example1   | 1.0.0         | MyKey1       |
| ExampleObjMap | 1.0.0          | example2   | 1.0.0         | MyKey2       |
+---------------+----------------+------------+---------------+--------------+

Performance issue

Using current version, for each operation save/read/delete of the service template below, control-loop runtime application access to 14 tables and handles 51 rows.

Code Block

language	yml
title	Example of Service Template
collapse	true

name: ToscaServiceTemplateSimple
version: 1.0.1
tosca_definitions_version: tosca_simple_yaml_1_3
data_types:
  onap.datatypes.ToscaConceptIdentifier:
    derived_from: tosca.datatypes.Root
    properties:
      name:
        type: string
        required: true
      version:
        type: string
        required: true
node_types:
  org.onap.policy.clamp.controlloop.Participant:
    version: 1.0.1
    derived_from: tosca.nodetypes.Root
    properties:
      provider:
        type: string
        requred: false
  org.onap.policy.clamp.controlloop.ControlLoopElement:
    version: 1.0.1
    derived_from: tosca.nodetypes.Root
    properties:
      provider:
        type: string
        requred: false
      participantType:
        type: onap.datatypes.ToscaConceptIdentifier
        requred: true
      startPhase:
        type: integer
        required: false
        constraints:
          - greater_or_equal: 0
        metadata:
          common: true
        description: check wiki documentation about start phase
          stopped simultaneously
  org.onap.policy.clamp.controlloop.ControlLoop:
    version: 1.0.1
    derived_from: tosca.nodetypes.Root
    properties:
      provider:
        type: string
        requred: false
      elements:
        type: list
        required: true
        entry_schema:
          type: onap.datatypes.ToscaConceptIdentifier
  org.onap.policy.clamp.controlloop.K8SMicroserviceControlLoopElement:
    version: 1.0.1
    derived_from: org.onap.policy.clamp.controlloop.ControlLoopElement
    properties:
      chart:
        type: string
        required: true
      configs:
        type: list
        required: false
      requirements:
        type: string
        requred: false
      templates:
        type: list
        required: false
        entry_schema:
      values:
        type: string
        requred: true
topology_template:
  node_templates:
    org.onap.k8s.controlloop.K8SControlLoopParticipant:
      version: 2.3.4
      type: org.onap.policy.clamp.controlloop.Participant
      type_version: 1.0.1
      description: Participant for K8S
      properties:
        provider: ONAP
   
    org.onap.domain.database.HelloWorld_K8SMicroserviceControlLoopElement:
      # Chart from any chart repository configured on helm client.
      version: 1.2.3
      type: org.onap.policy.clamp.controlloop.K8SMicroserviceControlLoopElement
      type_version: 1.0.0
      description: Control loop element for the K8S microservice for Hello World
      properties:
        provider: ONAP
        participantType:
          name: org.onap.k8s.controlloop.K8SControlLoopParticipant1
          version: 2.3.4
        chart:  
          chartId:         
            name: dummy
            version: 0.1.0 
          releaseName: test                         
          namespace: test   

    org.onap.domain.database.PMSH_K8SMicroserviceControlLoopElement:  
      # Chart from local file system    
      version: 1.2.3
      type: org.onap.policy.clamp.controlloop.K8SMicroserviceControlLoopElement
      type_version: 1.0.0
      description: Control loop element for the K8S microservice for PMSH
      properties:
        provider: ONAP
        participantType:
          name: org.onap.k8s.controlloop.K8SControlLoopParticipant2
          version: 2.3.4
        startPhase: 1
        chart:          
          chartId: 
            name: dcae-pmsh         
            version: 8.0.0
          namespace: onap 
          releaseName: pmshms
          repository:
            repoName: chartmuseum
            protocol: http
            address: 10.152.183.120
            port: 80
            userName: onapinitializer
            password: demo123456!
          overrideParams:
            global.masterPassword: test
            
                 

    org.onap.domain.database.Local_K8SMicroserviceControlLoopElement: 
      # Chart installation without passing repository name     
      version: 1.2.3
      type: org.onap.policy.clamp.controlloop.K8SMicroserviceControlLoopElement
      type_version: 1.0.0
      description: Control loop element for the K8S microservice for local chart
      properties:
        provider: ONAP
        participantType:
          name: org.onap.k8s.controlloop.K8SControlLoopParticipant
          version: 2.3.4
        chart:
          chartId:      
            name: nginx-ingress
            version: 0.9.1    
          releaseName: nginxms
          namespace: test   
          repository:
            repoName: nginx-stable       

    org.onap.domain.sample.GenericK8s_ControlLoopDefinition:
      version: 1.2.3
      type: org.onap.policy.clamp.controlloop.ControlLoop
      type_version: 1.0.0
      description: Control loop for Hello World
      properties:
        provider: ONAP
        elements:        
        - name: org.onap.domain.database.HelloWorld_K8SMicroserviceControlLoopElement
          version: 1.2.3   
        - name: org.onap.domain.database.PMSH_K8SMicroserviceControlLoopElement
          version: 1.2.3     
        - name: org.onap.domain.database.Local_K8SMicroserviceControlLoopElement
          version: 1.2.3

Multi templates

Right now using Spring repositories it is possible to create more than one service template, as service templates in policy-models/tosca. It works in both Eclipse-Link and Hibernate.

How to create additional service template (just add different name and version into the yaml file):

...

Move to Hibernate with EclipseLink tables is probably possible.
The presence of longblob types used to store whole objects is an issues, it is readable only by Java language or by any other language compatible with Java binary code. I am not sure if a db-migrator can handle that.
Document databases store all information for a given object in a single instance in the database, and every stored object can be different from every other. Each operation save/read/delete of a service template, could be done using one access to a document. So, using Cassandra/MongoDB /Cassandra will solve all issues. JpaRepository and and CassandraRepository/MongoRepository extend CrudRepository and expose the capabilities of the underlying persistence technology in addition to the rather generic persistence technology-agnostic interfaces like e.g. CrudRepository.

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Key

List of Objects using

ElementCollection (hacked)

Eclipse-Link

Hibernate

Removing @Lob Annotation

Map of Objects using OneToMany

Eclipse-Link

Map of Objects using OneToMany (fixed)

Removing @Lob Annotation

Map of Objects using OneToMany (fixed)

Eclipse-Link

Hibernate

Hibernate

Performance issue

Multi templates