休眠：無法找到persister：java.math.BigDecimal

我想結合guice，jpa和hibernate。 hibernate的初始化看起來不錯，直到我嘗試通過DAO訪問映射類。我發現所有的幫助請求，但我的問題是（現在）不是「自定義類」（至少我不這麼認爲）。休眠：無法找到persister：java.math.BigDecimal

一起沒什麼特別的。我得到了我的persistence.xml，它定義了我的類和一個基類（persist，findById，remove）的DAO。

public abstract class AbstractDao<E, K> implements Dao<E, K> { 

    @Inject 
    private EntityManager manager; 
    private final Class<E> entityClass; 

    @SuppressWarnings("unchecked") 
    public AbstractDao() { 
     final ParameterizedType genericSuperclass = (ParameterizedType) this.getClass().getGenericSuperclass(); 
     this.entityClass = (Class<E>) genericSuperclass.getActualTypeArguments()[1]; 
    } 

    @Override 
    public void persist(final E entity) { 
     this.manager.persist(entity); 
    } 

    @Override 
    public void remove(final E entity) { 
     this.manager.remove(entity); 
    } 

    @Override 
    public E findById(final K id) { 
     return this.manager.find(this.entityClass, id); 
    } 
}

如果我嘗試用DAO訪問數據庫一樣

final LayerDao dao = this.layerDaoProvider.get(); 
final Layer layer = dao.findById(386L); //Tried with BigDecimal, Long

我碰到下面的錯誤（我得到確切同樣的錯誤與java.lang.Long中）：

Caused by: org.hibernate.UnknownEntityTypeException: Unable to locate persister: java.math.BigDecimal 
    at org.hibernate.metamodel.internal.MetamodelImpl.locateEntityPersister(MetamodelImpl.java:637) ~[hibernate-core-5.2.2.Final.jar:5.2.2.Final] 
    at org.hibernate.internal.SessionImpl.locateEntityPersister(SessionImpl.java:2909) ~[hibernate-core-5.2.2.Final.jar:5.2.2.Final] 
    at org.hibernate.internal.SessionImpl.access$1800(SessionImpl.java:203) ~[hibernate-core-5.2.2.Final.jar:5.2.2.Final] 
    at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.<init>(SessionImpl.java:2660) ~[hibernate-core-5.2.2.Final.jar:5.2.2.Final] 
    at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.<init>(SessionImpl.java:2646) ~[hibernate-core-5.2.2.Final.jar:5.2.2.Final] 
    at org.hibernate.internal.SessionImpl.byId(SessionImpl.java:1181) ~[hibernate-core-5.2.2.Final.jar:5.2.2.Final] 
    at org.hibernate.internal.SessionImpl.find(SessionImpl.java:3357) ~[hibernate-core-5.2.2.Final.jar:5.2.2.Final] 
    at org.hibernate.internal.SessionImpl.find(SessionImpl.java:3332) ~[hibernate-core-5.2.2.Final.jar:5.2.2.Final] 
[..]

我沒想到會出現一些java核心類的問題。

這都是我的gradle配置的依賴關係：

compile group: 'org.slf4j', name: 'slf4j-api', version: '1.7.21'  
// https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-slf4j-impl 
compile group: 'org.apache.logging.log4j', name: 'log4j-slf4j-impl', version: '2.6.2' 
// https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-core 
compile group: 'org.apache.logging.log4j', name: 'log4j-core', version: '2.6.2' 
// https://mvnrepository.com/artifact/com.google.inject/guice 
compile group: 'com.google.inject', name: 'guice', version: '4.1.0' 
// https://mvnrepository.com/artifact/com.google.inject.extensions/guice-persist 
compile group: 'com.google.inject.extensions', name: 'guice-persist', version: '4.1.0' 
// https://mvnrepository.com/artifact/com.cathive.fx/fx-guice 
compile group: 'com.cathive.fx', name: 'fx-guice', version: '8.0.0' 
// https://mvnrepository.com/artifact/org.hibernate/hibernate-core 
compile group: 'org.hibernate', name: 'hibernate-core', version: '5.2+'

我缺少什麼？你需要更多的信息來幫助我嗎？

編輯＃1：我嘗試訪問的映射類。它使用Eclipse自動創建（最新JEE版）：

import java.io.Serializable; 
import javax.persistence.*; 
import java.math.BigDecimal; 
import java.util.Date; 


/** 
* The persistent class for the T_M_LAYER_NEU database table. 
* 
*/ 
@Entity 
@Table(name="T_M_LAYER_NEU") 
@NamedQuery(name="Layer.findAll", query="SELECT l FROM Layer l") 
public class Layer implements Serializable { 
    private static final long serialVersionUID = 1L; 

    @Id 
    @SequenceGenerator(name="T_M_LAYER_NEU_ID_GENERATOR", sequenceName="FIG_SYS_SEQ") 
    @GeneratedValue(strategy=GenerationType.SEQUENCE, generator="T_M_LAYER_NEU_ID_GENERATOR") 
    @Column(unique=true, nullable=false, precision=38) 
    private long id; 

    @Column(nullable=false, precision=1) 
    private BigDecimal component; 

    @Column(name="DISPLAY_ORDER", nullable=false, precision=3) 
    private BigDecimal displayOrder; 

    @Column(nullable=false, precision=1) 
    private BigDecimal exklusiv; 

    @Column(name="GEOMETRIETYP_ID_FK", precision=2) 
    private BigDecimal geometrietypIdFk; 

    @Temporal(TemporalType.DATE) 
    @Column(name="GUELTIG_BIS", nullable=false) 
    private Date gueltigBis; 

    @Temporal(TemporalType.DATE) 
    @Column(name="GUELTIG_VON", nullable=false) 
    private Date gueltigVon; 

    @Column(nullable=false, precision=1) 
    private BigDecimal isactive; 

    @Column(nullable=false, precision=1) 
    private BigDecimal iskulisse; 

    @Column(nullable=false, precision=1) 
    private BigDecimal isoverview; 

    @Column(name="LAYERTYP_ID_FK", nullable=false, precision=2) 
    private BigDecimal layertypIdFk; 

    @Column(nullable=false, length=80) 
    private String name; 

    @Column(name="R_O", nullable=false, precision=1) 
    private BigDecimal rO; 

    @Column(name="SOURCE_ID", precision=38) 
    private BigDecimal sourceId; 

    @Column(name="\"SYSTEM\"", nullable=false, precision=1) 
    private BigDecimal system; 

    @Column(name="USE_COMPLETECACHE", nullable=false, precision=1) 
    private BigDecimal useCompletecache; 

    @Column(name="XML_DEF", length=100) 
    private String xmlDef; 

    //bi-directional many-to-one association to Label 
    @ManyToOne 
    @JoinColumn(name="LABEL_ID_FK") 
    private Label label; 

    //bi-directional many-to-one association to Symbol 
    @ManyToOne 
    @JoinColumn(name="SYM_ID_FK") 
    private Symbol symbol; 

    //bi-directional many-to-one association to Tabellen 
    @ManyToOne 
    @JoinColumn(name="LAYERDEF_ID_FK") 
    private Tabellen table; 

    public Layer() { 
    } 

    public long getId() { 
     return this.id; 
    } 

    public void setId(long id) { 
     this.id = id; 
    } 

    public BigDecimal getComponent() { 
     return this.component; 
    } 

    public void setComponent(BigDecimal component) { 
     this.component = component; 
    } 

    public BigDecimal getDisplayOrder() { 
     return this.displayOrder; 
    } 

    public void setDisplayOrder(BigDecimal displayOrder) { 
     this.displayOrder = displayOrder; 
    } 

    public BigDecimal getExklusiv() { 
     return this.exklusiv; 
    } 

    public void setExklusiv(BigDecimal exklusiv) { 
     this.exklusiv = exklusiv; 
    } 

    public BigDecimal getGeometrietypIdFk() { 
     return this.geometrietypIdFk; 
    } 

    public void setGeometrietypIdFk(BigDecimal geometrietypIdFk) { 
     this.geometrietypIdFk = geometrietypIdFk; 
    } 

    public Date getGueltigBis() { 
     return this.gueltigBis; 
    } 

    public void setGueltigBis(Date gueltigBis) { 
     this.gueltigBis = gueltigBis; 
    } 

    public Date getGueltigVon() { 
     return this.gueltigVon; 
    } 

    public void setGueltigVon(Date gueltigVon) { 
     this.gueltigVon = gueltigVon; 
    } 

    public BigDecimal getIsactive() { 
     return this.isactive; 
    } 

    public void setIsactive(BigDecimal isactive) { 
     this.isactive = isactive; 
    } 

    public BigDecimal getIskulisse() { 
     return this.iskulisse; 
    } 

    public void setIskulisse(BigDecimal iskulisse) { 
     this.iskulisse = iskulisse; 
    } 

    public BigDecimal getIsoverview() { 
     return this.isoverview; 
    } 

    public void setIsoverview(BigDecimal isoverview) { 
     this.isoverview = isoverview; 
    } 

    public BigDecimal getLayertypIdFk() { 
     return this.layertypIdFk; 
    } 

    public void setLayertypIdFk(BigDecimal layertypIdFk) { 
     this.layertypIdFk = layertypIdFk; 
    } 

    public String getName() { 
     return this.name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public BigDecimal getRO() { 
     return this.rO; 
    } 

    public void setRO(BigDecimal rO) { 
     this.rO = rO; 
    } 

    public BigDecimal getSourceId() { 
     return this.sourceId; 
    } 

    public void setSourceId(BigDecimal sourceId) { 
     this.sourceId = sourceId; 
    } 

    public BigDecimal getSystem() { 
     return this.system; 
    } 

    public void setSystem(BigDecimal system) { 
     this.system = system; 
    } 

    public BigDecimal getUseCompletecache() { 
     return this.useCompletecache; 
    } 

    public void setUseCompletecache(BigDecimal useCompletecache) { 
     this.useCompletecache = useCompletecache; 
    } 

    public String getXmlDef() { 
     return this.xmlDef; 
    } 

    public void setXmlDef(String xmlDef) { 
     this.xmlDef = xmlDef; 
    } 

    public Label getLabel() { 
     return this.label; 
    } 

    public void setLabel(Label label) { 
     this.label = label; 
    } 

    public Symbol getSymbol() { 
     return this.symbol; 
    } 

    public void setSymbol(Symbol symbol) { 
     this.symbol = symbol; 
    } 

    public Tabellen getTable() { 
     return this.table; 
    } 

    public void setTable(Tabellen table) { 
     this.table = table; 
    } 
}

編輯＃2：使用的DAO-Class。除了泛型的類型定義：

public class LayerDao extends AbstractDao<Layer, Long> { 

}

來源

2016-08-15 semTex

最後我發現了錯誤。在AbtractDao構造我使用相當普遍代碼來確定類類型：

final ParameterizedType genericSuperclass = (ParameterizedType) this.getClass().getGenericSuperclass(); 
this.entityClass = (Class<E>) genericSuperclass.getActualTypeArguments()[1];

仔細看顯示，我試圖使用密鑰對象類型genericSuperclass.getActualTypeArguments（）[1]代替實體對象類型genericSuperclass.getActualTypeArguments（）[0]。

正確的構造是這樣的，現在

@SuppressWarnings("unchecked") 
    public AbstractDao() { 
     final ParameterizedType genericSuperclass = (ParameterizedType) this.getClass().getGenericSuperclass(); 
     this.entityClass = (Class<E>) genericSuperclass.getActualTypeArguments()[0]; 
    }

，一切都按預期工作。抱歉給你帶來不便。

來源

2016-08-16 13:42:45 semTex

休眠：無法找到persister：java.math.BigDecimal

回答

相關問題