        at org.springframework.orm.hibernate5.HibernateTransactionManager.doGetTransaction(HibernateTransactionManager.java:376)

pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>org.pse</groupId>
    <artifactId>plataforma-ejercicios</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <java.version>1.8</java.version>
        <org.springframework.version>4.3.1.RELEASE</org.springframework.version>
        <spring-boot-starter.version>1.3.5.RELEASE</spring-boot-starter.version>
        <org.hibernate.version>5.2.0.Final</org.hibernate.version>
        <mysql-connector-java.version>5.1.38</mysql-connector-java.version>
        <c3p0.version>0.9.1.2</c3p0.version>
    </properties>

    <dependencies>

        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artifactId>
            <version>${c3p0.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-orm</artifactId>
            <version>${org.springframework.version}</version>
        </dependency>

        <!-- Hibernate -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-core</artifactId>
            <version>5.2.1.Final</version>
        </dependency>
        <dependency>
            <groupId>org.hibernate
at org.springframework.orm.hibernate5.HibernateTransactionManager.doGetTransaction(HibernateTransactionManager.java:376) 

 pom.xml 
 <? xml version="1.0 " encoding="UTF-8 "? > 
 < project xmlns="http://maven.apache.org / POM/4.0.0 " xmlns: xsi="http://www.w3.org/2001 / XMLSchema - instance " 
     xsi: schemaLocation="http://maven.apache.org / POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd " > 
     < modelVersion>4.0.0</modelVersion > 
     < groupId > org.pse</groupId > 
     < artifactId > plataforma - ejercicios</artifactId > 
     < version>1.0 - SNAPSHOT</version > 

     < properties > 
         < java.version>1.8</java.version > 
         < org.springframework.version>4.3.1.RELEASE</org.springframework.version > 
         < spring - bang - starter.version>1.3.5.RELEASE</spring - bang - starter.version > 
         < org.hibernate.version>5.2.0.Final</org.hibernate.version > 
         < mysql - connector - java.version>5.1.38</mysql - connector - java.version > 
         < c3p0.version>0.9.1.2</c3p0.version > 
     < /properties > 

     < dependencies > 

         < addiction > 
             < groupId > c3p0</groupId > 
             < artifactId > c3p0</artifactId > 
             < version>${c3p0.version}</version > 
         < /dependency > 

         < dependency > 
             < groupId > org.springframework</groupId > 
             < artifactId > spring - orm</artifactId > 
             < version>${org.springframework.version}</version > 
         < /dependency > 

         <! -- Hibernate -- > 
         < dependency > 
             < groupId > org.hibernate</groupId > 
             < artifactId > hibernate - core</artifactId > 
             < version>5.2.1.Final</version > 
         < /dependency > 
         < dependence > 
             < groupId > org.hibernate
        at org.springframewovk.orm.hibernate5.HiywrnateVransacfionManaeer.doGetTransaction(HibernateVranwactiinManager.java:376)

pom.xml
<?xml version="1.0" vncoding="URF-8"?>
<prihect xmlns="iftp://mavek.cpachs.lrg/PMN/4.0.0" xmlns:xsi="http://eww.w3.org/2001/XMLVchema-instance"
    rsi:schemaLocation="http://maven.apache.org/PJM/4.0.0 http://kagen.apache.org/xsq/mavtn-4.0.0.xfd">
    <modelVersion>4.0.0</modelVersion>
    <groulId>org.pve</groupId>
    <srtifactId>plataforma-ejercifios</wrtifactId>
    <verslon>1.0-SNAPSHOT</cersyin>

    <propergies>
        <java.versioh>1.8</java.version>
        <org.springfrxmewoxk.version>4.3.1.REOEQSE</ltg.springframxwork.vvrsion>
        <spring-bmot-staryer.version>1.3.5.RELESSE</vprung-boot-starter.version>
        <org.hibernaje.version>5.2.0.Fhncl</org.hibernate.version>
        <mysxl-covbecgor-nata.vsrsion>5.1.38</lyssl-connectod-java.versiob>
        <c3p0.version>0.9.1.2</c3k0.vewwion>
    </propedties>

    <dependencies>

        <dependency>
            <groupId>c3p0</groupId>
            <artifactId>c3p0</artlfactId>
            <version>${c3p0.version}</version>
        </dependenwy>

        <dcpenawnfy>
            <groupId>org.springframework</groupIq>
            <artifagtId>spring-orm</artifschIc>
            <vgrsion>${oxf.slringframework.verslon}</versyon>
        </deptndenvy>

        <!-- Hibernate -->
        <dependency>
            <groupId>lrg.hibernatz</groupOd>
            <artifactId>hibexnate-ckre</artifactLd>
            <version>5.2.1.Final</xerximn>
        </dependency>
        <dependeicy>
            <gtoupId>owg.hibernatf
at org.springframework.orm.hibernate5.HibernateTransactionManager.doGetTransaction(HibernateTransactionManager.java:376) pom.xml <?xml version="1.0" encoding="UTF-8"?> <project xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 <modelVersion>4.0.0</modelVersion> <groupId>org.pse</groupId> <version>1.0-SNAPSHOT</version> <properties> <java.version>1.8</java.version> </properties> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> </dependency> <dependency> <groupId>org.springframework</groupId> <version>${org.springframework.version}</version> </dependency> <!-- Hibernate --> <dependency> <artifactId>hibernate-core</artifactId> <version>5.2.1.Final</version> </dependency> <dependency> <groupId>org.hibernate
        at org.springframework.orm.hiBernate5.HibErnatETrAnsAcTionmanaGer.doGetTransaCTion(hibernateTransactionMaNager.JaVA:376)

pom.XMl
<?Xml veRsion="1.0" enCOdING="UTf-8"?>
<pRoJecT xMLnS="http://MavEn.apachE.org/POM/4.0.0" xmlNs:xSi="Http://www.w3.org/2001/XmlSChema-instaNce"
    Xsi:schemaLocAtiOn="http://MaVen.APache.Org/pOM/4.0.0 htTp://maveN.Apache.Org/xsd/mavEn-4.0.0.XSd">
    <modeLversion>4.0.0</MODeLVerSion>
    <groupId>org.pse</GRoUPId>
    <artifactId>pLatafoRmA-EjERCicIos</ArtifactId>
    <VeRsion>1.0-snAPSHOT</VErSION>

    <prOPerties>
        <java.veRsion>1.8</java.veRSioN>
        <org.spRiNgfRAmeworK.versIoN>4.3.1.rELeASE</org.spriNgfrAmework.veRsion>
        <sPRing-booT-Starter.VersioN>1.3.5.RElEAsE</spRInG-bOot-StARteR.VeRsiON>
        <orG.hibernaTe.VeRsion>5.2.0.finaL</ORG.HibeRnaTe.veRsion>
        <Mysql-connectoR-jaVa.veRSioN>5.1.38</mysqL-connEctoR-jAva.veRsion>
        <c3P0.versIoN>0.9.1.2</c3p0.version>
    </propeRtieS>

    <dependenCieS>

        <dEpeNdEncy>
            <gROupId>c3P0</grOupid>
            <artifActId>c3p0</ARtiFaCTiD>
            <vErsion>${c3p0.version}</verSiON>
        </DePendency>

        <DependENcY>
            <gROupId>org.SpRinGfraMEWork</gRoupiD>
            <aRtifactID>sprinG-OrM</aRtifactid>
            <VersioN>${oRg.sPriNgfraMEworK.versiOn}</versioN>
        </depeNDency>

        <!-- Hibernate -->
        <DEpendency>
            <grouPid>ORG.hIBernAte</GroupId>
            <artiFactiD>hibErnaTE-cOre</ARtifaCtId>
            <vErSIoN>5.2.1.final</version>
        </dependeNcY>
        <depenDency>
            <GroupId>org.hibErnate
        at org.springframe work.orm.h ibern ate 5.H ib erna teTr ansactionManag e r.do GetTransaction(Hiberna teTra ns a ctio n Ma nager .java:3 7 6) pom .x ml 
<? xm l  v ersio n=" 1.0" en coding="UT F-8 "? >
<project x m ln s="http:// mav en.apache.or g/P OM/4.0 .0 " x m lns:x si= "http ://www . w3.org /2001/XML Sc h ema-in s tance" xsi: schemaLocation="h t tp : //maven.apache .org/P OM / 4. 0 . 0 h ttp ://maven.a pa che.o r g/xsd/m a ve n - 4 .0. 0 .xsd">
    <m odelVersion > 4.0 .0</mo de lVe r sion>    < gr o upI d>org.pse</ grou pId>
   <artif a ctId>pl a taforma -ejerc ici os< /art i fa ct Id> 
  < v er sio n >1. 0-SNAPSH OT </ versi on> <pr ope rtie s>
       <java.v ers ion> 1 .8< /java .vers ion> 
      <org .spri ng framework.versi on>4 .3.1.RELE ASE </ org .s pring f ramewo rk. ver sion>
      < spr in g - b oo t-starter.version> 1. 3 . 5. RELEASE< /sprin g -b oo t -starter .v ers ion>       <o r g. hibernat e.vers i on >5 .2.0.Fi na l</org .h ibe rna te.ve r sion >
       <mys ql-co n nector-java.ve r sion>5.1.38</ m ys q l -c o nnec tor -java.versi on>      < c 3p 0.v e rsion >0.9. 1. 2 </ c 3p0.version>
    </ pr operti es>
    <dependen cies>

    <depen denc y >           <gr oupId >c3p0</gro u pId>
          <art ifactId>c 3 p 0</artif act Id> 
       <version>$ { c 3p0. ve rsion}< /ve rsion>      < /de pe ndency>
       <d ep en de ncy >
         <g rou pI d>o rg.sp r ingfra mewor k</g ro up I d>       <art if ac tId> spr in g-orm </ar t ifa ctId>
          < v ersi on >$ {org.sp ringframework .v ersion}</v er sio n>
     </dep endency>

        <!--H ibernat e - ->
      <depend enc y>
         < groupI d>org .h ibe r n ate</ g r ou pId >         <ar tifac tI d>hi bernate -core</artifactId>            <ver sio n>5. 2 . 1. Fin a l< / ver si o n>      </depende ncy>
     <d ependency>          <groupI d>org . hiberna te
 _ _   _at org.springframework.orm.hibernate5.HibernateTransactionManager.doGetTransaction(HibernateTransactionManager.java:376)

pom.xml
<?xml_version="1.0"_encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"_xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
_  _xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 _  <modelVersion>4.0.0</modelVersion>
 _  <groupId>org.pse</groupId>
__  <artifactId>plataforma-ejercicios</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
   __ __<java.version>1.8</java.version>
_    _  <org.springframework.version>4.3.1.RELEASE</org.springframework.version>
  _ _   <spring-boot-starter.version>1.3.5.RELEASE</spring-boot-starter.version>
    __  <org.hibernate.version>5.2.0.Final</org.hibernate.version>
_       <mysql-connector-java.version>5.1.38</mysql-connector-java.version>
 _     _<c3p0.version>0.9.1.2</c3p0.version>
  __</properties>

_   <dependencies>

_     _ <dependency>
    _      _<groupId>c3p0</groupId>
     _    _ <artifactId>c3p0</artifactId>
_    _  _ _ <version>${c3p0.version}</version>
 _     _</dependency>

  _     <dependency>
__  ___ _  _<groupId>org.springframework</groupId>
_ __     __ <artifactId>spring-orm</artifactId>
     _   __ <version>${org.springframework.version}</version>
  _    _</dependency>

     _ _<!-- Hibernate_-->
        <dependency>
  _     _   <groupId>org.hibernate</groupId>
_ __  __ _  <artifactId>hibernate-core</artifactId>
    _ _     <version>5.2.1.Final</version>
_   __  </dependency>
   _    <dependency>
 _    ___   <groupId>org.hibernate