I just added a new entity to my project and now it doesn't start.
I think it is related to having a `@ManyToOne` being part of a composite key but I'm not sure.
I reduced my problem to the following entities:

**A.class:**

```java
@Table(name = "A")
@Entity
@IdClass(KeyA.class)
public class A {

   @Id
   private String aId;

   @Id
   @ManyToOne
   private B b;

   public String getaId() {
      return aId;
   }

   public void setaId(String aId) {
      this.aId = aId;
   }

   public B getB() {
      return b;
   }

   public void setB(B b) {
      this.b = b;
   }
}

```

**B.class:**

```java
@Table(name = "B")
@Entity
@IdClass(KeyB.class)
public class B {

   @Id
   String bId;

   @Id
   String bId2;

   public String getbId() {
      return bId;
   }

   public void setbId(String bId) {
      this.bId = bId;
   }

   public String getbId2() {
      return bId2;
   }

   public void setbId2(String bId2) {
      this.bId2 = bId2;
   }
}

```

**KeyA.class:**

```java
public class KeyA implements Serializable {

   private String aId;
   private String b;
}

```

**KeyB.class**

```java
public class KeyB implements Serializable{

   public String bId;
   public String bId2;
}

```

Exception thrown:

```
        Error creating bean with name 'entityManagerFactory' defined in class path resource
        [...]
        Caused by: org.hibernate.HibernateException: Unable to instantiate default tuplizer [org.hibernate.tuple.component.PojoComponentTuplizer]
    [...]
    Caused by: java.lang.reflect.InvocationTargetException: null
        at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_201]
        at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_201]
        at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_201]
        at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_201]
        at org.hibernate.tuple.component.ComponentTuplizerFactory.constructTuplizer(ComponentTuplizerFactory.java:104) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        ... 43 common frames omitted
    Caused by: org.hibernate.PropertyNotFoundException: Could not locate field name [bId] on class [java.lang.String]
        at org.hibernate.internal.util.ReflectHelper.findField(ReflectHelper.java:371) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.property.access.internal.PropertyAccessFieldImpl.<init>(PropertyAccessFieldImpl.java:34) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.property.access.internal.PropertyAccessStrategyFieldImpl.buildPropertyAccess(PropertyAccessStrategyFieldImpl.java:26) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.mapping.Property.getGetter(Property.java:311) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.tuple.component.PojoComponentTuplizer.buildGetter(PojoComponentTuplizer.java:141) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]

```

I tried everything, including importing latest javassist.
I'm running Spring Boot 2.2.5.RELEASE on Java 1.8 (it also happens in 11)