今天在项目中使用Spring Data Solr导入动态域数据报错, 控制台打印错误信息如下

Exception in thread "main" org.springframework.data.solr.UncategorizedSolrException: nested exception is java.lang.NullPointerException

at org.springframework.data.solr.core.SolrTemplate.execute(SolrTemplate.java:145)

at org.springframework.data.solr.core.SolrTemplate.saveBeans(SolrTemplate.java:199)

at org.springframework.data.solr.core.SolrTemplate.saveBeans(SolrTemplate.java:194)

at com.pinyougou.solrutil.ImportItem.importAllItem(ImportItem.java:46)

at com.pinyougou.solrutil.ImportItem.main(ImportItem.java:53)

Caused by: java.lang.NullPointerException

at org.springframework.data.solr.core.convert.MappingSolrConverter.writeWildcardMapPropertyToTarget(MappingSolrConverter.java:310)

at org.springframework.data.solr.core.convert.MappingSolrConverter.access$100(MappingSolrConverter.java:62)

at org.springframework.data.solr.core.convert.MappingSolrConverter$2.doWithPersistentProperty(MappingSolrConverter.java:287)

at org.springframework.data.solr.core.convert.MappingSolrConverter$2.doWithPersistentProperty(MappingSolrConverter.java:269)

at org.springframework.data.mapping.model.BasicPersistentEntity.doWithProperties(BasicPersistentEntity.java:311)

at org.springframework.data.solr.core.convert.MappingSolrConverter.write(MappingSolrConverter.java:269)

at org.springframework.data.solr.core.convert.MappingSolrConverter.write(MappingSolrConverter.java:258)

at org.springframework.data.solr.core.convert.MappingSolrConverter.write(MappingSolrConverter.java:62)

at org.springframework.data.solr.core.SolrTemplate.convertBeanToSolrInputDocument(SolrTemplate.java:463)

at org.springframework.data.solr.core.SolrTemplate.convertBeansToSolrInputDocuments(SolrTemplate.java:546)

at org.springframework.data.solr.core.SolrTemplate.access$100(SolrTemplate.java:91)

at org.springframework.data.solr.core.SolrTemplate$5.doInSolr(SolrTemplate.java:202)

at org.springframework.data.solr.core.SolrTemplate$5.doInSolr(SolrTemplate.java:199)

at org.springframework.data.solr.core.SolrTemplate.execute(SolrTemplate.java:141)

public class TbItem implements Serializable {

@Field

private Long id;

//其他属性略

@Dynamic //动态域

@Field("item_spec_*")

private Map specMap;

//set() get()略

！

@Component("importItem")

public class ImportItem {

@Autowired

private SolrTemplate solrTemplate;

@Autowired

private TbItemMapper itemMapper;

private void importAllItem(){

TbItemExample example = new TbItemExample();

TbItemExample.Criteria criteria = example.createCriteria();

criteria.andStatusEqualTo("1");//只查询状态为 1 的数据

List list = itemMapper.selectByExample(example);

for (TbItem item : list) {

/*

spec是POJO中另外的属性

item.getSpec() 得到数据结构: {"网络":"移动4G","机身内存":"32G"}

使用fastjson 转换为Map,存放在POJO中

*/

Map specMap = JSON.parseObject(item.getSpec(), Map.class);

item.setSpecMap(specMap);

}

/*

*统一保存

*/

solrTemplate.saveBeans(list);

solrTemplate.commit();

}

public static void main(String[] args) {

ApplicationContext applicationContext = new ClassPathXmlApplicationContext("classpath*:spring/applicationContext*.xml");

ImportItem util = (ImportItem) applicationContext.getBean("importItem");

util.importAllItem();

}

}

在网上没有找到对应的解决方案,不断尝试,将POJO中Map的范型加上后结果OK!!!

@Dynamic //动态域

@Field("item_spec_*")

private Map specMap;//最好将范型加上

//set() get()略

因为是Maven分模块开发,将POJO重新install就可以了

2019-07-1510:47:32

作者：深海收破烂

标签：java,data,springframework,报错,org,SolrTemplate,solr

来源： https://www.cnblogs.com/itboxue/p/11187550.html