在一段非常简单的代码中
SolrClient solrServer;
solrServer = new HttpSolrClient.Builder("http://localhost:8983/solr/test1")
.build();
List<MyBean> myBeans = new LinkedList<>(Arrays.asList(new MyBean("a","1",1),new MyBean("b", "2", 2), new MyBean("c","3",3)));
String searchTerm = "a";
try {
solrServer.addBeans(myBeans);
solrServer.commit();
SolrQuery solrQuery = new SolrQuery();
solrQuery.set("q", searchTerm);
QueryResponse queryResponse = solrServer.query(solrQuery);
List<MyBean> foundDocuments = queryResponse.getBeans(MyBean.class);
System.out.println(foundDocuments);
} catch (SolrServerException | IOException ex) {
throw new RuntimeException(ex);
}
在Java SE主方法中使用新的Solr核心test1
(在终端中使用bin/solr create_core -c test1
创建)
public class MyBean {
@Field
private String property1;
@Field
private String property2;
private int property3;
public MyBean() {
}
public MyBean(String property1, String property2, int property3) {
this.property1 = property1;
this.property2 = property2;
this.property3 = property3;
}
[public getter and setter for property1, property2 and property3]
}
我经常
Exception in thread "main" org.apache.solr.client.solrj.beans.BindingException: Could not instantiate object of class richtercloud.solr.bean.indexing.MyBean
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 richtercloud.solr.bean.indexing.NewMain.main(NewMain.java:42)
Caused by: org.apache.solr.client.solrj.beans.BindingException: Exception while setting value : [a] on private java.lang.String richtercloud.solr.bean.indexing.MyBean.property1
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)
... 3 more
Caused by: java.lang.IllegalArgumentException: Can not set java.lang.String field richtercloud.solr.bean.indexing.MyBean.property1 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)
... 5 more
我无法理解Solr为什么要在字符串字段上设置字符串列表。一个错误?
MCVE位于https://github.com/krichter722/solr-bean-indexing。我找到了Retrieve Object from Solr,但它并没有解释为什么我会得到异常,我觉得我做的和那里的建议一样。
我使用的是Solr 6.5.1。
答案 0 :(得分:2)
很可能在您的核心http://localhost:8983/solr/test1
中,字段property1
的{{3}}属性设置为true
。
这意味着字段property1
必须是ArrayList
。
如果您想要一个简单的String
,您应该更改架构中的字段配置(设置multiValued="false"
)。