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When to use EntityManager.find() vs EntityManager.getReference() with JPA
...
private String name;
private Integer age;
}
public class PersonServiceImpl implements PersonService {
public void changeAge(Integer personId, Integer newAge) {
Person person = em.getReference(Person.class, personId);
// person is a proxy
person.setAge(newAge...
Non-Relational Database Design [closed]
...hDB, SimpleDB, Google App Engine datastore, Voldemort, Cassandra, SQL Data Services, etc.). They're also often referred to as "key/value stores", and at base they act like giant distributed persistent hash tables.
...
mysql error 1364 Field doesn't have a default values
...m /etc/my.cnf -- in the line starting with sql_mode -- and restarted mysql service and issue went away.
– Mike Volmar
Jan 28 '19 at 13:42
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Exporting APK from eclipse (ADT) silently crashes
...ed export, with:
ADT Version: 22.2.1.v201309180102-833290
Eclipse Juno Service Release 2 Build id: 20130225-0426
Gentoo Linux running Java 1.7.0_45-b18.
UPDATE: Few exports after, I still get crashes from time to time, but no very frequently.
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Cannot use Server.MapPath
... Cant't find such reference I found only this two: System.Web.ApplicationServices, System.Web.Services....
– a1204773
Jun 19 '12 at 18:01
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Maven dependency spring-web vs spring-webmvc
...rvlet module) contains Spring’s model-view-controller (MVC) and REST Web Services implementation for web applications. Spring’s MVC framework provides a clean separation between domain model code and web forms and integrates with all of the other features of the Spring Framework.
The spring-web...
scrapyd 转入后台daemon守护模式运行的方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...大功告成：
可使用命令进行操作了（启动停止状态）
service scrapyd {start|stop|status}
二、设置为系统启动项
1、启用禁用命令：
sysv-rc-conf scrapyd on/off
scrapy scrapyd
Static method behavior in multi-threaded environment in java
... @selig if I have a class with only instance methods for ex: a service class and It is singleton then I don't need to worry about multiple threads executing the instance methods at a time as the service class does not hold any state where state is present only if class has instance varia...
Servlet returns “HTTP Status 404 The requested resource (/servlet) is not available”
... a 405 is evidence that the servlet itself is actually found).
Overriding service() is a bad practice, unless you're reinventing a MVC framework — which is very unlikely if you're just starting out with servlets and are clueless as to the problem described in the current question ;) See also Desi...
Same Navigation Drawer in different Activities
... layers));
View footerView = ((LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(
R.layout.drawer_list_footer, null, false);
drawerList.addFooterView(footerView);
drawerList.setOnItemClickListener(new OnItemClickListener() ...