java - Criteria API JPA 2 - JOIN 导致 MySQLSyntaxErrorException : You have an error in your SQL syntax

Question

我正在使用 Criteria API 进行动态查询。问题是我有:

CriteriaQuery<ExhibitorWrapper> cq = builder.createQuery(ExhibitorWrapper.class);
Root<Exhibitor> from = cq.from(Exhibitor.class);
Join<Exhibitor, Document> document = from.join("document",JoinType.LEFT);

多选

cq.multiselect(
            from.get("id"),
            from.get("distributor").get("id"),
            from.get("distributor").get("country"),
            from.get("distributor").get("city"),
            from.get("distributor").get("name"),
            from.get("distributor").get("address"),
            from.get("name"),
            from.get("exhibitorList").get("catalogueNumber"),
            from.get("exhibitorList").get("oracleNumber"),
            from.get("price"),
            from.get("quantity"),
            from.get("updaded"),
            from.get("created"),
            from.get("merchadniser").get("firstName"),
            from.get("merchadniser").get("lastName"),
            from.get("status"),
            from.get("document")
            )
                .where(predicates.toArray(new Predicate[] {}));

参展商有实体:

@OneToMany(cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER, mappedBy = "exhibitor")
    @Fetch(FetchMode.SUBSELECT)
    private List<Document> document = new ArrayList<>();

文档实体有:

@ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "exhibitor_id")
    private Exhibitor exhibitor;

ExhibitorWrapper 是带有一些字段的包装类，在使用连接添加文档实体(以及包装类中的右侧字段)之前可以完美地工作

ExhibitorWrapper constructor:
ExhibitorWrapper(..........String status, **List<Document> document**)

我明白

MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'as col_16_0_ from exhibitor exhibitor0_ left outer join document document1_ on e' at line 1

我只想在 ExhibitorWrapper 对象中包含包含文档的列表。

编辑:完整日志:

Hibernate: 
    select
        exhibitor0_.id as col_0_0_,
        exhibitor0_.distributor_id as col_1_0_,
        distributo2_.country as col_2_0_,
        distributo2_.city as col_3_0_,
        distributo2_.name as col_4_0_,
        distributo2_.address as col_5_0_,
        exhibitor0_.name as col_6_0_,
        exhibitorl6_.catalogue_number as col_7_0_,
        exhibitorl6_.oracle_number as col_8_0_,
        exhibitor0_.price as col_9_0_,
        exhibitor0_.quantity as col_10_0_,
        exhibitor0_.last_update as col_11_0_,
        exhibitor0_.created as col_12_0_,
        merchandis8_.first_name as col_13_0_,
        merchandis8_.last_name as col_14_0_,
        exhibitor0_.status as col_15_0_,
        . as col_16_0_ 
    from
        exhibitor exhibitor0_ 
    left outer join
        document document1_ 
            on exhibitor0_.id=document1_.exhibitor_id cross 
    join
        distributor distributo2_ 
    left outer join
        distributor_merchandiser distributo2_1_ 
            on distributo2_.id=distributo2_1_.distributor_id cross 
    join
        exhibitor_list exhibitorl6_ cross 
    join
        merchandiser merchandis8_ 
    inner join
        document document10_ 
            on exhibitor0_.id=document10_.exhibitor_id 
    where
        exhibitor0_.distributor_id=distributo2_.id 
        and exhibitor0_.exhibitor_list_id=exhibitorl6_.id 
        and exhibitor0_.merchadniser_id=merchandis8_.id 
        and 1=1 
    order by
        exhibitor0_.id asc
2018-02-06 15:04:53.511  WARN 6646 --- [nio-8080-exec-7] o.h.e.j.s.SqlExceptionHelper             : SQL Error: 1064, SQLState: 42000
2018-02-06 15:04:53.511 ERROR 6646 --- [nio-8080-exec-7] o.h.e.j.s.SqlExceptionHelper             : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'as col_16_0_ from exhibitor exhibitor0_ left outer join document document1_ on e' at line 1
2018-02-06 15:04:53.515 ERROR 6646 --- [nio-8080-exec-7] o.a.c.c.C.[.[.[.[dispatcherServlet]      : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is javax.persistence.PersistenceException: org.hibernate.exception.SQLGrammarException: could not extract ResultSet] with root cause

com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'as col_16_0_ from exhibitor exhibitor0_ left outer join document document1_ on e' at line 1
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[?:1.8.0_161]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[?:1.8.0_161]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[?:1.8.0_161]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[?:1.8.0_161]
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.44.jar:5.1.44]
    at com.mysql.jdbc.Util.getInstance(Util.java:408) ~[mysql-connector-java-5.1.44.jar:5.1.44]
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:943) ~[mysql-connector-java-5.1.44.jar:5.1.44]
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973) ~[mysql-connector-java-5.1.44.jar:5.1.44]
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909) ~[mysql-connector-java-5.1.44.jar:5.1.44]
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527) ~[mysql-connector-java-5.1.44.jar:5.1.44]
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680) ~[mysql-connector-java-5.1.44.jar:5.1.44]
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2487) ~[mysql-connector-java-5.1.44.jar:5.1.44]
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1858) ~[mysql-connector-java-5.1.44.jar:5.1.44]
    at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1966) ~[mysql-connector-java-5.1.44.jar:5.1.44]
    at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeQuery(ProxyPreparedStatement.java:52) ~[HikariCP-2.7.4.jar:?]
    at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeQuery(HikariProxyPreparedStatement.java) ~[HikariCP-2.7.4.jar:?]
    at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:60) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.loader.Loader.getResultSet(Loader.java:2168) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1931) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:1893) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.loader.Loader.doQuery(Loader.java:938) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:341) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.loader.Loader.doList(Loader.java:2692) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.loader.Loader.doList(Loader.java:2675) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2507) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.loader.Loader.list(Loader.java:2502) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:502) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:384) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:216) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1490) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1445) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1414) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.query.Query.getResultList(Query.java:146) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:72) ~[hibernate-core-5.2.12.Final.jar:5.2.12.Final]
    at com.exhibitors.services.ExhibitorService.exhibitorReport(ExhibitorService.java:310) ~[classes/:?]
    at com.exhibitors.services.ExhibitorService$$FastClassBySpringCGLIB$$b8ce895f.invoke(<generated>) ~[classes/:?]
    at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:747) ~[spring-aop-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) ~[spring-aop-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:294) ~[spring-tx-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:98) ~[spring-tx-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:689) ~[spring-aop-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at com.exhibitors.services.ExhibitorService$$EnhancerBySpringCGLIB$$e2dc381c.exhibitorReport(<generated>) ~[classes/:?]
    at com.exhibitors.controller.ReportsController.customPeriodReport(ReportsController.java:46) ~[classes/:?]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_161]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_161]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_161]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_161]
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:871) ~[spring-webmvc-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:777) ~[spring-webmvc-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) ~[spring-webmvc-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) ~[spring-webmvc-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:978) ~[spring-webmvc-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:870) ~[spring-webmvc-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:635) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:855) ~[spring-webmvc-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:742) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) ~[tomcat-embed-websocket-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:127) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:91) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.authentication.rememberme.RememberMeAuthenticationFilter.doFilter(RememberMeAuthenticationFilter.java:158) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:170) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:200) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:64) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178) ~[spring-security-web-5.0.0.RELEASE.jar:5.0.0.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:357) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:270) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:108) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:81) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.springframework.session.web.http.SessionRepositoryFilter.doFilterInternal(SessionRepositoryFilter.java:146) ~[spring-session-core-2.0.0.RC2.jar:2.0.0.RC2]
    at org.springframework.session.web.http.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:81) ~[spring-session-core-2.0.0.RC2.jar:2.0.0.RC2]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) ~[spring-web-5.0.2.RELEASE.jar:5.0.2.RELEASE]
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) ~[tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:478) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:803) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1459) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_161]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_161]
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.23.jar:8.5.23]
    at java.lang.Thread.run(Thread.java:748) [?:1.8.0_161]

Answer 1

在多选中，参数必须是标量值(如 int 或 String)或实体，但不能是实体集合。

就你的情况

from.get("document")
is
private List<Document> document = new ArrayList<>();