org.apache.solr.client.solrj.beans.BindingException：设置值时出现异常

Question

当我试图从Solr获得DTO类型列表中的结果时，我遇到了上述错误。

我有下面的bean类

@Field("email_address")
private String email_address;

@Field("bean_module")
private String bean_module;

@Field("previous_status")
private List<String> previous_status;

我尝试使用以下代码从Solr获得结果：

SolrQuery params = new SolrQuery();
QueryResponse response = SOLRCORE.query(params);
SolrDocumentList productDocumentList = response.getResults();
DocumentObjectBinder binder = new DocumentObjectBinder();
List<LeadDTO>  arrayList = binder.getBeans(LeadDTO.class,productDocumentList);

上面的代码抛出以下异常。

org.apache.solr.client.solrj.beans.BindingException: Could not instantiate object of class com.kaldin.dto.LeadDTO
    at org.apache.solr.client.solrj.beans.DocumentObjectBinder.getBean(DocumentObjectBinder.java:71)
    at org.apache.solr.client.solrj.beans.DocumentObjectBinder.getBeans(DocumentObjectBinder.java:50)
    at org.apache.solr.client.solrj.response.QueryResponse.getBeans(QueryResponse.java:618)
    at com.kaldin.dao.SolarDao.getSearchResult(SolarDao.java:193)
    at com.kaldin.dao.SolarDao.main(SolarDao.java:452)
Caused by: org.apache.solr.client.solrj.beans.BindingException: Exception while setting value : [[email protected]] on private java.lang.String com.kaldin.dto.LeadDTO.email_address
    at org.apache.solr.client.solrj.beans.DocumentObjectBinder$DocField.set(DocumentObjectBinder.java:455)
    at org.apache.solr.client.solrj.beans.DocumentObjectBinder$DocField.inject(DocumentObjectBinder.java:438)
    at org.apache.solr.client.solrj.beans.DocumentObjectBinder.getBean(DocumentObjectBinder.java:67)
    ... 4 more
Caused by: java.lang.IllegalArgumentException: Can not set java.lang.String field com.kaldin.dto.LeadDTO.email_address to java.util.ArrayList
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167)
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171)
    at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:81)
    at java.lang.reflect.Field.set(Field.java:764)
    at org.apache.solr.client.solrj.beans.DocumentObjectBinder$DocField.set(DocumentObjectBinder.java:449)

以下是我们在Solr中添加的字段

<field name="email_address" type="text_general" indexed="true" stored="true"/>
<field name="bean_module" type="text_general" indexed="true" stored="true"/>
<field name="previous_status" type="text_general" multiValued="true" indexed="true" stored="true"/>

我在google上做了很多搜索，并在StackOverflow上检查了同样的问题并且累了，但我仍坚持同样的问题

Answer 1

我面临同样的例外。我添加了multiValued = "false"，它对我有用。由于日志告诉ArrayList将被分配到String，这是不可能的。

引起：org.apache.solr.client.solrj.beans.BindingException：在私有java.lang.String上设置值：[[email protected]]时出现异常

你身上的email_address DTO是字符串

@Field("email_address")
private String email_address;

我希望当你像这样使用multiValued="false"它会起作用。

<field name="email_address" type="text_general" indexed="true" stored="true" multiValued="false"/>