我使用Hibernate并尝试执行以下操作:
@Temporal(TemporalType.DATE)
@Column(name = "BIRTHDAY")
private Instant birthday;
但有这个例外:
Caused by: org.hibernate.AnnotationException: @Temporal should only be set on a java.util.Date or java.util.Calendar property:
正如我所建议的那样尝试使用
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-java8</artifactId>
<version>${hibernate.ver}</version>
</dependency>
但有相同的例外.我应该做一些额外的步骤或如何解决这种情况？
我正在尝试在我们的项目中设置 checkstyle - 但似乎Maven(v3.8.3) 或maven-checkstyle-plugin(v3.1.1) 本身不知道 Java 14 record（我们使用 Java 17）。
Caused by: java.lang.IllegalStateException: /Users/dmitry.adonin/IdeaProjects/raap/src/main/java/com/xxx/web/dto/Request.java:3:8: unexpected token: record
at com.puppycrawl.tools.checkstyle.JavaParser$1.reportError (JavaParser.java:93)
at com.puppycrawl.tools.checkstyle.grammar.GeneratedJavaRecognizer.typeDefinition (GeneratedJavaRecognizer.java:411)
at com.puppycrawl.tools.checkstyle.grammar.GeneratedJavaRecognizer.compilationUnit (GeneratedJavaRecognizer.java:202)
at com.puppycrawl.tools.checkstyle.JavaParser.parse (JavaParser.java:99)
at com.puppycrawl.tools.checkstyle.TreeWalker.processFiltered (TreeWalker.java:159)
at com.puppycrawl.tools.checkstyle.api.AbstractFileSetCheck.process (AbstractFileSetCheck.java:85)
at com.puppycrawl.tools.checkstyle.Checker.processFile (Checker.java:329)
at com.puppycrawl.tools.checkstyle.Checker.processFiles (Checker.java:291)
at com.puppycrawl.tools.checkstyle.Checker.process (Checker.java:216)
at org.apache.maven.plugins.checkstyle.exec.DefaultCheckstyleExecutor.executeCheckstyle (DefaultCheckstyleExecutor.java:202)
at org.apache.maven.plugins.checkstyle.CheckstyleViolationCheckMojo.execute (CheckstyleViolationCheckMojo.java:545)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128) …有人可以建议我怎样才能将列表变换["bla", "blabla", "blablabla"]为映射,就像{"bla" : 3, "blabla" : 6, "blablabla" : 9}单词代表键,值代表单词长度？
我做的事情如下:
Map<String, Integer> map = list.stream().collect(Collectors.groupingBy(Function.identity(), String::length));
但没有运气.
谢谢!
jsonschema2pojo文档中有一个地方描述了启用JSR-303 注释生成的可能性。如果我理解正确，它可以通过 Maven 插件配置来完成。有人可以展示如何完成它，应该使用插件配置中的哪个标签？谢谢大家！
我有一个代码片段,如:
List<Ticket> lowestPriceTickets(List<Info> infos, Ticket lowestPriceTicket) {
List<Ticket> allLowestPriceTickets = new ArrayList<>();
for (Info info : infos)
{
if (info.getTicketTypeList() != null)
{
for (Ticket ticket : info.getTicketTypeList())
{
if (lowestPriceTicket.getCode().order() == ticket.getCode().order())
{
allLowestPriceTickets.add(ticket);
}
}
}
}
return allLowestPriceTickets;
}
我正在尝试使用Java 8流重构它,但后来坚持了下来
infos.stream()
.filter(info -> info.getTicketTypeList() != null)
.map(Info::getTicketTypeList)
因为我想过滤每个Ticket但是看看Stream<List<Ticket>>,有人可以建议请问这个方法应该如何完成？谢谢!
我在MySQL 5.6中有一个表，其文本类型字段为“ custom_info”，该字段以字符串形式存在JSON。这样的JSON的存在字段“ clients”带有数组。
为了选择“客户”为空的记录，我使用查询：
select custom_info from users where custom_info like '%"clients":[]%'
如何在“客户”数组至少存在一个元素的情况下检索记录？