Querydsl-线程“ main”中的异常java.lang.IllegalArgumentException：未提供任何源
作者：互联网
我正在使用Spring MVC,Thymeleaf,JPA(休眠)和Querydsl构建系统.在测试所有内容时,我遇到了此异常：
log4j:WARN No appenders could be found for logger (org.springframework.core.env.StandardEnvironment).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
Serviço nulo: false
[SER_USU] - Fazendo consulta...
[SER_USU] - Dao nulo: false
Exception in thread "main" java.lang.IllegalArgumentException: No sources given
at com.querydsl.jpa.JPAQueryBase.serialize(JPAQueryBase.java:56)
at com.querydsl.jpa.JPAQueryBase.serialize(JPAQueryBase.java:50)
at com.querydsl.jpa.impl.AbstractJPAQuery.createQuery(AbstractJPAQuery.java:98)
at com.querydsl.jpa.impl.AbstractJPAQuery.createQuery(AbstractJPAQuery.java:94)
at com.querydsl.jpa.impl.AbstractJPAQuery.fetch(AbstractJPAQuery.java:201)
at com.regra7.st.db.dao.Dao_Usuario.getPorID(Dao_Usuario.java:35)
at com.regra7.st.servico.Ser_Usuario.cadastrar(Ser_Usuario.java:46)
at com.regra7.st.testes.TesteDAO_001.<init>(TesteDAO_001.java:43)
at com.regra7.st.testes.TesteDAO_001.main(TesteDAO_001.java:19)
不幸的是,这不是很具描述性,因此,我不知道该怎么办.我已经尝试了所有方法,但是找不到解决方案.是的,那就是所有消息(堆栈跟踪).这是我正在使用的一些文件…
pom.xml(我可能有一些依赖关系错误,我不清楚)：
<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>com.regra7</groupId>
<artifactId>Sistema_Teste_001</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<build>
<sourceDirectory>src</sourceDirectory>
<plugins>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
<!-- QUERYDSL -->
<plugin>
<groupId>com.mysema.maven</groupId>
<artifactId>apt-maven-plugin</artifactId>
<version>1.1.3</version>
<executions>
<execution>
<goals>
<goal>process</goal>
</goals>
<configuration>
<outputDirectory>target/generated-sources/java</outputDirectory>
<processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.apache.commons/commons-lang3 -->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>
<!-- SPRING MVC -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>
<!-- SPRING CONTEXT (SPRING CORE - TRANSIENT) -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework/spring-orm -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>
<!-- POSTGRESQL DRIVER JDBC -->
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>9.3-1102-jdbc41</version>
</dependency>
<!-- API SERVLET E JSP -->
<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
</dependency>
<!-- BEAN VALIDATION -->
<!-- https://mvnrepository.com/artifact/javax.validation/validation-api -->
<dependency>
<groupId>javax.validation</groupId>
<artifactId>validation-api</artifactId>
<version>1.1.0.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>5.2.6.Final</version>
</dependency>
<!-- IMPLEMENTAÇÃO BEAN VALIDATION (HIBERNATE) -->
<!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-validator -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.3.4.Final</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.hibernate.javax.persistence/hibernate-jpa-2.1-api -->
<dependency>
<groupId>org.hibernate.javax.persistence</groupId>
<artifactId>hibernate-jpa-2.1-api</artifactId>
<version>1.0.0.Final</version>
</dependency>
<dependency>
<groupId>javax.el</groupId>
<artifactId>javax.el-api</artifactId>
<version>2.2.4</version>
</dependency>
<dependency>
<groupId>org.glassfish.web</groupId>
<artifactId>javax.el</artifactId>
<version>2.2.4</version>
</dependency>
<!-- THYMELEAF -->
<!-- https://mvnrepository.com/artifact/org.thymeleaf/thymeleaf -->
<dependency>
<groupId>org.thymeleaf</groupId>
<artifactId>thymeleaf</artifactId>
<version>3.0.3.RELEASE</version>
</dependency>
<!-- THYMELEAF PARA O SPRING 4 -->
<!-- https://mvnrepository.com/artifact/org.thymeleaf/thymeleaf-spring4 -->
<dependency>
<groupId>org.thymeleaf</groupId>
<artifactId>thymeleaf-spring4</artifactId>
<version>3.0.3.RELEASE</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.querydsl/querydsl-core -->
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-core</artifactId>
<version>4.1.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.querydsl/querydsl-jpa -->
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-jpa</artifactId>
<version>4.1.4</version>
</dependency>
<!-- https://mvnrepository.com/artifact/com.querydsl/querydsl-apt -->
<dependency>
<groupId>com.querydsl</groupId>
<artifactId>querydsl-apt</artifactId>
<version>4.1.4</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.6.1</version>
</dependency>
<!-- C3P0 -->
<!-- https://mvnrepository.com/artifact/com.mchange/c3p0 -->
<dependency>
<groupId>com.mchange</groupId>
<artifactId>c3p0</artifactId>
<version>0.9.5.2</version>
</dependency>
</dependencies>
</project>
spring-config.xml(app-context.xml)：
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!-- ARQUIVO DE CONFIGURAÇÃO DE CONTEXTO DE APLICAÇÃO. -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd ">
<!-- Mapeamento de recursos (arquivos css, fontes, imagens, dentre outros). -->
<!-- <mvc:resources mapping="/css/**" location="/WEB-INF/recursos/css/" /> -->
<!-- <mvc:resources mapping="/imagens/**" location="/WEB-INF/recursos/imagens/" /> -->
<!-- <mvc:resources mapping="/fontes/**" location="/WEB-INF/recursos/fontes/" /> -->
<!-- <mvc:resources mapping="/fontes/**" location="/WEB-INF/recursos/javascript/" /> -->
<!-- Possibilita o uso de anotações Spring Mvc. -->
<mvc:annotation-driven />
<!-- Alternativa a declarar PersistenceAnnotationBeanPostProcessor,
um processador de anotações que lê @PersistenceContext. -->
<context:annotation-config />
<!-- Define local para procura de componentes Spring (beans configurados
por anotações em classes). -->
<context:component-scan base-package="com.regra7.st.controle" />
<context:component-scan base-package="com.regra7.st.db.dao" />
<context:component-scan base-package="com.regra7.st.servico" />
<context:component-scan base-package="com.regra7.st.testes" />
<!-- MINHA DEFINIÇÃO COM MEUS CONVERSORES CRIADOS -->
<mvc:annotation-driven conversion-service="servicoConversao"/>
<!-- PROPERTY EDITOR NÃO FUNCIONOU, MAS ISSO SIM! -->
<bean id="servicoConversao"
class="org.springframework.format.support.FormattingConversionServiceFactoryBean">
<property name="converters">
<set>
<bean class="com.regra7.st.formularios.conversores.Cov_String_LocalDate"/>
<bean class="com.regra7.st.formularios.conversores.Cov_LocalDate_String"/>
</set>
</property>
</bean>
<!-- Template Resolver para Template Engine. -->
<!-- <bean id="templateResolver" class="org.thymeleaf.templateresolver.ServletContextTemplateResolver">
<property name="prefix" value="/WEB-INF/templates/" /> <property name="suffix"
value=".html" /> <property name="templateMode" value="HTML5" /> </bean> -->
<!-- SpringResourceTemplateResolver automatically integrates with Spring's
own -->
<!-- resource resolution infrastructure, which is highly recommended. -->
<bean id="templateResolver"
class="org.thymeleaf.spring4.templateresolver.SpringResourceTemplateResolver">
<property name="prefix" value="/WEB-INF/templates/" />
<property name="suffix" value=".html" />
<!-- HTML is the default value, added here for the sake of clarity. -->
<property name="templateMode" value="HTML" />
<!-- Template cache is true by default. Set to false if you want -->
<!-- templates to be automatically updated when modified. -->
<property name="cacheable" value="true" />
</bean>
<!-- SpringTemplateEngine automatically applies SpringStandardDialect and -->
<!-- enables Spring's own MessageSource message resolution mechanisms. -->
<bean id="templateEngine" class="org.thymeleaf.spring4.SpringTemplateEngine">
<property name="templateResolver" ref="templateResolver" />
<!-- Enabling the SpringEL compiler with Spring 4.2.4 or newer can speed
up -->
<!-- execution in most scenarios, but might be incompatible with specific -->
<!-- cases when expressions in one template are reused across different
data -->
<!-- ypes, so this flag is "false" by default for safer backwards -->
<!-- compatibility. -->
<property name="enableSpringELCompiler" value="true" />
</bean>
<!-- View resolver do Thymeleaf. -->
<bean class="org.thymeleaf.spring4.view.ThymeleafViewResolver">
<property name="templateEngine" ref="templateEngine" />
</bean>
<!-- DATA SOURCE - Implementação do C3p0 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
<!-- Propriedades de conexão -->
<property name = "driverClass" value="org.postgresql.Driver" />
<property name = "jdbcUrl" value="jdbc:postgresql://localhost:5432/SistemaTeste" />
<property name = "user" value="postgres" />
<property name = "password" value="admin" />
<!-- Propriedades C3p0 -->
<property name = "initialPoolSize" value="3" />
<property name = "minPoolSize" value="5" />
<property name = "maxPoolSize" value="20" />
<property name = "maxIdleTime" value="1800" /> <!-- 1800 = 30 min -->
<property name = "maxStatements" value="50" />
</bean>
<!-- Fábrica EntityManager -->
<bean id="emf"
class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="SistemaTeste" />
<property name="dataSource" ref="dataSource" />
<property name="jpaDialect">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" />
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">none</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQL82Dialect</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.format_sql">false</prop>
<prop key="hibernate.generate_statistics">false</prop>
<prop key="hibernate.use_sql_comments">false</prop>
<prop key="hibernate.default_schema">regrast</prop>
<prop key="hibernate.jdbc.batch_size">50</prop>
</props>
</property>
</bean>
<!-- Gerenciador de transações PlatformTransactionManager -->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="emf" />
</bean>
<!-- INTERCEPTADORES -->
<mvc:interceptors>
<mvc:interceptor>
<mvc:mapping path="/usuario/*" />
<bean class="com.regra7.st.interceptadores.Login" />
</mvc:interceptor>
</mvc:interceptors>
</beans>
persistence.xml：
<?xml version="1.0" encoding="UTF-8"?>
<persistence
xmlns="http://java.sun.com/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"
version="1.0">
<persistence-unit name="SistemaTeste" transaction-type="RESOURCE_LOCAL">
<!-- PROVEDOR JPA -->
<provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
</persistence-unit>
</persistence>
我的主要考试班：
public class TesteDAO_001
{
public static void main(String[] args)
{
new TesteDAO_001(); // Line 19
}
public TesteDAO_001()
{
AbstractApplicationContext ac = new ClassPathXmlApplicationContext("/META-INF/spring-config.xml");
Ser_Usuario servico = ac.getBean(Ser_Usuario.class); // Service class
// For_Cadastro is an account registration form.
For_Cadastro form = new For_Cadastro();
form.setNome("Maria Pereira Maxwell"); // Name
form.setLogin("rodrigologinsoares001");
form.setSenha1("minhasenha001001"); // Password
form.setSenha2("minhasenha001001"); // Password confirmation
form.setCpf("01234567890"); // CPF = Brazil's Social ID
form.setNascimento(LocalDate.now()); // Birthday
form.setPai(0L); // Father
form.setMae(0L); // Mother
form.setGenero(0L); // Gender
System.out.printf("Serviço nulo: %s%n" , servico == null);
servico.cadastrar(form); // Line 43
ac.close();
}
}
服务方式：
@Autowired
private Dao_Usuario _daoUsu;
@Transactional(rollbackFor = Exception.class)
public void cadastrar(For_Cadastro form)
{
imprimir("Fazendo consulta...");
imprimir(String.format("Dao nulo: %s%n", this._daoUsu == null));
// This may return null.
Usuario pai = this._daoUsu.getPorID(form.getPai()); // Line 46
Usuario mae = this._daoUsu.getPorID(form.getMae());
imprimir(String.format("pai nulo: %s%n", pai == null));
imprimir(String.format("mea nulo: %s%n", mae == null));
// Usuario is a Domain Model Object. A POJO representation of a table.
Usuario usu = new Usuario(form.getCpf()); // CPF = Brazil's Social ID
usu.setGenero(Genero.getGenero(form.getGenero())); // Gender
usu.setNome(form.getNome()); // Name
usu.setLogin(form.getLogin());
usu.setSenha(form.getSenha1().getBytes()); // Password
usu.setNascimento(form.getNascimento()); // Birthday
usu.setMae(mae); // Mother
usu.setPai(pai); // Father
imprimir("Modelo criado. Salvando...");
this._daoUsu.salvarAtualizar(usu); // Save/Update
imprimir("Persistência concluída.");
}
DAO方法：
@PersistenceContext
protected EntityManager _em;
@Override
public Usuario getPorID(Long id)
{
if(id == null)
{
return null;
}
return new JPAQueryFactory(this._em)
.select(QUsuario.usuario)
.where(QUsuario.usuario.id.eq(id))
.fetchOne(); // Line 32
}
我正在学习如何使用Querydsl.如果您需要我在此处添加更多代码,请这样说.我已经研究过google,并且也在社区中研究过.不幸的是我什么也没找到.有人可以帮我吗？
感谢您的时间和耐心等待.
编辑
这是我的域模型Usuario类：
@Entity
@Table(name="tb_usuarios")
public class Usuario
{
@Id
@SequenceGenerator(
name="ger_id_usuario" ,
sequenceName="tb_usuarios_id_seq" ,
allocationSize=1 ,
initialValue = 1)
@GeneratedValue(
strategy=GenerationType.SEQUENCE ,
generator="ger_id_usuario")
@Column(
name = "usu_id" ,
unique = true)
protected Long id;
// Name
@Column(name = "usu_nome" , unique = true)
protected String nome;
// "Business Key"
@Column(name = "usu_login" , unique = true)
protected String login;
// Password
@Column(name = "usu_senha" , unique = true)
protected byte[] senha;
// Brazil's Social ID
// "Business Key"
@Column(name = "usu_cpf" , unique = true)
protected String cpf;
// Registration moment (date and time)
@Column(name = "usu_nascimento")
protected Date nascimento;
// Gender
@Column(name = "usu_genero")
protected byte genero;
// Father of this person (it may be null).
@ManyToOne(fetch = FetchType.LAZY , cascade=CascadeType.ALL)
@JoinColumn(name = "usu_pai")
protected Usuario pai;
// Mother of this person (it may be null).
@ManyToOne(fetch = FetchType.LAZY , cascade=CascadeType.ALL)
@JoinColumn(name = "usu_mae")
protected Usuario mae;
@Column(name = "usu_cadastro")
protected Timestamp cadastro;
// Children as a father.
@OneToMany(mappedBy="pai" , fetch = FetchType.LAZY , cascade = CascadeType.ALL)
protected Set<Usuario> filhosComoPai;
// Children as a mother.
@OneToMany(mappedBy="mae" , fetch = FetchType.LAZY , cascade = CascadeType.ALL)
protected Set<Usuario> filhosComoMae;
// Required by default by JPA, public or protected constructor, with no arguments.
protected Usuario()
{
this.filhosComoPai = new HashSet<>();
this.filhosComoMae = new HashSet<>();
}
/** For anyone who works with this class, it must provide a CPF, guaranteeing uniqueness, thus preventing this class from suffering problems when it is inside collections. */
public Usuario(String cpf)
{
if(Util_Validador.isCPFValido(cpf) == false)
{
throw new IllegalArgumentException("CPF não encontra-se válido.");
}
this.cpf = cpf;
this.filhosComoPai = new HashSet<>();
this.filhosComoMae = new HashSet<>();
}
// Name
public void setNome(String nome)
{
if(Util_Validador.isNomeValido(nome, 8) == false)
{
throw new IllegalArgumentException("Nome de pessoa não encontra-se válido.");
}
this.nome = nome;
}
public void setLogin(String login)
{
if(Util_Validador.isLoginValido(login, 8) == false)
{
throw new IllegalArgumentException("Login não encontra-se válido.");
}
this.login = login;
}
// Password
public void setSenha(byte[] senha)
{
this.senha = senha;
}
// Birthday
public void setNascimento(LocalDate nascimento)
{
this.nascimento = Date.valueOf(nascimento);
}
// Gender
public void setGenero(Genero genero)
{
if(genero == null)
{
throw new NullPointerException("O gênero passado como argumento encontra-se nulo.");
}
this.genero = genero.getID();
}
/** Defines a father for this person (child).*/
public void setPai(Usuario pai)
{
// It is already?
if( this.pai == null ||
this.pai.equals(pai) == false)
{
// Remove previous father from this child.
if(this.pai != null)
{
this.pai.removeFilho(this);
}
// Defines the new father for this child.
// There may be a null assignment here!
this.pai = pai;
// Add this child to a new parent.
if(pai != null)
{
if(pai.getFilhos().contains(this) == false)
{
pai.addFilho(this);
}
}
}
}
// Same logic.
public void setMae(Usuario mae)
{
if( this.mae == null ||
this.mae.equals(mae) == false)
{
if(this.mae != null)
{
this.mae.removeFilho(this);
}
this.mae = mae;
if(mae != null)
{
if(mae.getFilhos().contains(this) == false)
{
mae.addFilho(this);
}
}
}
}
public Long getID()
{
return this.id;
}
// Name
public String getNome()
{
return this.nome;
}
public String getLogin()
{
return this.login;
}
// Password
public byte[] getSenha()
{
return this.senha;
}
// CPF = Brazil's Social ID
public String getCPF()
{
return this.cpf;
}
// Birthday
public LocalDate getNascimento()
{
return this.nascimento.toLocalDate();
}
// Gender
public Genero getGenero()
{
return Genero.getGenero(
Long.getLong(
Byte.toString(this.genero)));
}
// Father
public Usuario getPai()
{
return this.pai;
}
// Mother
public Usuario getMae()
{
return this.mae;
}
// Date and time of registration (produced by database after insertion).
public LocalDateTime getCadastro()
{
return this.cadastro.toLocalDateTime();
}
// Children of this person
public Set<Usuario> getFilhos()
{
// "Genero" is a enum type (Gender), with MALE ("HOMEM") and FEMALE ("MULHER").
if(this.getGenero() == Genero.HOMEM)
{
return Collections.unmodifiableSet(this.filhosComoPai);
}
return Collections.unmodifiableSet(this.filhosComoMae);
}
// Add a child ("filho") to this person.
public boolean addFilho(Usuario filho)
{
this.isUsuarioNula(filho);
boolean add = false;
// FATHER
if(this.getGenero() == Genero.HOMEM)
{
add = this.filhosComoPai.add(filho);
if(add)
{
if( filho.getPai() == null ||
filho.getPai().equals(this) == false)
{
Usuario paiAnterior = filho.getPai();
if(paiAnterior != null)
{
paiAnterior.removeFilho(filho);
}
filho.setPai(this);
}
}
}
// MOTHER
else
{
add = this.filhosComoMae.add(filho);
if(add)
{
if( filho.getMae() == null ||
filho.getMae().equals(this) == false)
{
Usuario maeAnterior = filho.getMae();
if(maeAnterior != null)
{
maeAnterior.removeFilho(filho);
}
filho.setMae(this);
}
}
}
return add;
}
// Removes the child ("filho") from this person.
public boolean removeFilho(Usuario filho)
{
this.isUsuarioNula(filho);
boolean rem = false;
// FATHER
if(this.getGenero() == Genero.HOMEM)
{
rem = this.filhosComoPai.remove(filho);
if(rem)
{
if( filho.getPai() == null ||
filho.getPai().equals(this) == false)
{
filho.setPai(null);
}
}
}
// MOTHER
else
{
rem = this.filhosComoMae.remove(filho);
if(rem)
{
if( filho.getMae() == null ||
filho.getMae().equals(this) == false)
{
filho.setMae(null);
}
}
}
return rem;
}
// Just to print the same message.
private void isUsuarioNula(Usuario p)
{
if(p == null)
{
throw new IllegalArgumentException("Usuario passada em argumento encontra-se nula.");
}
}
@Override
public boolean equals(Object o)
{
if (o == null)
{
return false;
}
else if (o == this)
{
return true;
}
else if (o.getClass() != this.getClass())
{
return false;
}
Usuario c = (Usuario) o;
// This ensures consistent data work, and prevents something from happening silently, without us knowing why it happened.
if(c.getCPF() == null || c.getCPF().length() <= 0)
{
throw new IllegalStateException("Valor de CPF inexistente. Uma comparação não é possível.");
}
return c.getCPF().equals(this.getCPF());
}
@Override
public int hashCode()
{
// I'm using Apacho Commons Lang.
return new HashCodeBuilder()
.append(this.getCPF()).toHashCode();
}
}
数据库已创建.我正在我的个人电脑上对此进行测试.
编辑2
我想分享我的项目.不幸的是,我不知道如何使用Github,我的帖子有将近3万个字符,因此我将我的项目(由Eclipse Mars 2制作)上载为war文件.这里是链接：
http://www.megafileupload.com/8hon/Sistema_Teste_001.war(单击免费用户下载以下载战争文件)
mirror(单击下载此文件以下载)
为了帮助您,每个软件包都包含一个名为“ package-info”的文件.如果有任何疑问,请签出此文件.除此之外,还添加了英语注释以进行澄清.
我很抱歉.我知道以这种方式下载项目不是很方便,但这是我当时发现的唯一解决方案.这样,您可以完全看到我的项目.
回答您的问题,我将以可执行的Java程序的正常方式测试此代码. Q类正在生成,而我的IDE则没有任何语法错误或任何错误.我右键单击我的项目,然后选择“运行方式…”->在“ 3 Java应用程序”中运行.要生成我的Q类,请单击“运行方式…”-> “ 8个Maven生成源”.
解决方法:
好吧,我不好意思说我没早点听说.您查询的语法实际上是错误的
return new JPAQueryFactory(this._em)
.select(QUsuario.usuario)
.where(QUsuario.usuario.id.eq(id))
.fetchOne();
应该
return new JPAQueryFactory(this._em)
.selectFrom(QUsuario.usuario)
.where(QUsuario.usuario.id.eq(id))
.fetchOne();
它的selectFrom而不是select.
标签：jpa,hibernate,spring,java,querydsl 来源： https://codeday.me/bug/20191026/1935683.html