PostGIS Geometry saving: "Invalid endian flag value encountered."

pilladooo's solution works with spring boot 2.0.3, hibernate/spatial 5.2.17.Final, Postgres 9.5.

Column in entity in my case is defined as @Column(name = "geometry") private Geometry geometry;

and in database as type 'geometry' (to avoid bytea type that hibernate auto generates)

Firstly I solved 'Invalid endian flag value encountered' with adding columnDefinition = "geometry", but after that hibernate would fail schema validation with "Schema-validation: wrong column type encountered in column [geometry] in table [my_shema.my_geometry_table]; found [geometry (Types#OTHER)], but expecting [bytea (Types#VARBINARY)]"

after adding spring.jpa.properties.hibernate.dialect=org.hibernate.spatial.dialect.postgis.PostgisDialect it finally worked. ColumnDefinition is also redundant now

I solve this problem adding to 'application.properties' this line:

spring.jpa.properties.hibernate.dialect=org.hibernate.spatial.dialect.postgis.PostgisDialect

The solution seems to be the following:
@Column to map the field to the desired column with JPA annotations
@Type to specify the Hibernate mapping with the dialect.

@Column(columnDefinition = "Geometry", nullable = true) 
@Type(type = "org.hibernate.spatial.GeometryType")
public Point centerPoint;

You could add the Hibernate property inside the hibernate.cfg.xml file to see the db request and try to catch the string-encoded problem with a text based editor like Notepad++ with "UTF-8"/"ANSI"/"other charsets"

<!--hibernate.cfg.xml -->
<property name="show_sql">true</property>
<property name="format_sql">true</property>
<property name="use_sql_comments">true</property>

To add the hibernate properties you will have an hibernate.cfg.xml file with the following stuff. Don't copy/paste it because it is MySQL oriented. Just look where I have inserted the properties I evocated previously.

 <?xml version="1.0" encoding="utf-8"?>
 <!DOCTYPE hibernate-configuration PUBLIC
 "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
 "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 <hibernate-configuration>
      <session-factory>
           <property name="hibernate.bytecode.use_reflection_optimizer">true</property>
           <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
           <property name="hibernate.connection.password">db-password</property>
           <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/db-name</property>
           <property name="hibernate.connection.username">db-username</property>
           <property name="hibernate.default_entity_mode">pojo</property>
           <property name="hibernate.dialect">org.hibernate.dialect.MySQL5InnoDBDialect</property>
           <property name="hibernate.format_sql">true</property>
           <property name="hibernate.search.autoregister_listeners">false</property>
           **<property name="hibernate.show_sql">true</property>**
           <property name="hibernate.use_sql_comments">false</property>

           <mapping ressource="...." />
           <!-- other hbm.xml mappings below... -->

      </session-factory>
 </hibernate-configuration>

Another way to log all sql is to add package specific properties inside a log4j.properties file:

log4j.logger.org.hibernate.SQL=DEBUG
log4j.logger.org.hibernate.type=TRACE

Good luck!