小编Sem*_*lov的帖子

我正在开发app,我需要在ListView中显示建议,当方向改变时,我希望隐藏该列表.但它无论如何都出现在屏幕上.我试过这个:1)获取列表适配器并清除它.2)在方向改变之前设置可见性GONE(但在onCreate之后再次可见)3)在onCreate中设置可见性GONE,但列表仍然出现在屏幕上(我想也许android保存旧列表,因为我再次初始化列表视图,它看起来像空的,但屏幕上的列表不是).那么,我怎么能摆脱这个名单呢？

是否有可能有PROPAGATION_NESTED在@Transactional()使用JPA Postgres的？我正进入（状态：

org.springframework.transaction.NestedTransactionNotSupportedException:
JpaDialect does not support savepoints - check your JPA provider's capabilities

我试过了：

@Bean
public PlatformTransactionManager transactionManager() {
    JpaTransactionManager transactionManager = new JpaTransactionManager();
    transactionManager.setEntityManagerFactory(entityManagerFactory()
                .getObject());
    transactionManager.setNestedTransactionAllowed(true);
    return transactionManager;
}

但是没有成功。

我是C++中模板编程的新手,所以我决定从编写模板列表开始.我得到的线这个错误Node<T> *head;,并Node<T> *tail;

这是我的头文件(因为错误只出现在那里):

#ifndef LIST_H
#define LIST_H

using namespace std;

template <class T> class List {

public:
    List();
    T get(const int n);
    void add(const T element);
private:
    Node<T> *head;
    Node<T> *tail;
    int size;
};

template <class T> class Node {
public :
    Node();
    T get();
    void setNext(const Node<T> *next);
    Node<T> getNext();
    void setValue(const T value);
private:
   T value;
   Node *next;
};

#endif // LIST_H

哦,我typename之前尝试过添加Node<T>,但它给了我expected nested-name-specifier before 'Node'.

我正在使用maven-compiler-plugin:2.3.2,每次我ContentType在导入中有枚举()的类中进行更改时,我需要制作clean,否则它会给我:

ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project wp2: Compilation failure
[ERROR] /home/semyon/development/.../ContentManager.java:[15,46] error: cannot access ContentType
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile) on project wp2: Compilation failure
/home/semyon/development/.../ContentManager.java:[15,46] error: cannot access ContentType

at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.MojoExecutor.executeForkedExecutions(MojoExecutor.java:364)
...

ContentType是enum这样的:

import org.jetbrains.annotations.NotNull;

public enum ContentType {

    ...; 

    private final String title;

    private final boolean hasJad;

    private final CoreType coreType;

    private final String[] …