reading properties file failure

reading properties file failure - java

I am having some trouble reading in a properties file. I want to read it in from console, but for now I am just using a variable to test it. I want to send the String of the file path to another class which will then read and set the properties, though I am getting a nullpointer and I am not sure why.
here is the app.java class with the main:
public static void main(final String [] args){
String path = "C:/Users/aak7133/Desktop/test.properties";
AppConfig config = new AppConfig();
try{
config.loadFile(path);
}catch(NullPointerException | FileNotFoundException e){
System.out.println("fail..");
}
}
and here is the appConfig.java class that receives the string (just the receiving part):
public void loadFile(String filepath) throws FileNotFoundException{
try{
prop.load(new FileInputStream(filepath));
} catch(IOException e){
throw new FileNotFoundException("File '" + filepath + "' not found.");
}
setProperties();
System.out.println(this.getFtpHost());
}
Just to see if I was reading in the properties correctly I did that print with one of the properties. The null pointer is in the main, so is it that I am not handling the try catch correctly or what?

I guess prop is not properly initialized in AppConfig. The NullPointerException may come from here.

Related

Relative path to file | Springboot

I am new to Spring-boot/Java and trying to read the contents of a file in a String.
What's the issue:
I'm getting "File not found exception" and unable to read the file. Apparently, I'm not giving the correct file path.
i've attached the directory structure and my code. I'm in FeedProcessor file and want to read feed_template.php (see image)
public static String readFileAsString( ) {
String text = "";
try {
// text = new String(Files.readAllBytes(Paths.get("/src/main/template/feed_template_head.php")));
text = new String(Files.readAllBytes(Paths.get("../../template/feed_template_head.php")));
} catch (IOException e) {
e.printStackTrace();
}
return text;
}

You need to put template folder inside resource folder. And then use following code.
#Configuration
public class ReadFile {
private static final String FILE_NAME =
"classpath:template/feed_template_head.php";
#Bean
public void initSegmentPerformanceReportRequestBean(
#Value(FILE_NAME) Resource resource,
ObjectMapper objectMapper) throws IOException {
new BufferedReader(resource.getInputStream()).lines()
.forEach(eachLine -> System.out.println(eachLine));
}
}
I suggest you to go though once Resource topic in spring.
https://docs.spring.io/spring/docs/3.0.x/spring-framework-reference/html/resources.html

How to read Key - value pair from property file using annotations

How to read this (fixedRate = 12000) 12000 form property file in Spring.
#Scheduled(fixedRate=120000)
public void tlogZipping() throws MposWSException {
LOGGER.info("Started tlog Zipping Job............. {}" + new Date());
try {
//......................
} catch (Exception e) {
LOGGER.error("FAIL TO CREATE RECEIPT ZIP FILE: {}",e);
throw new MposWSException(MposWSErrorCodes.FAIL_TO_CREATE_RECEIPT_ZIP_FILE, e);
}
LOGGER.info("Stopped tlog Zipping Job.............");
}

You can add your properties file to the folder where your classes are exists.
and then try this code.
#PropertySource("classpath:config.properties") //set your Properties file source.
public class YourClass{
//1.2.3.4
#Value("${TLOG_ZIPPING_TIME_INTERVEL_IN_MINUTES }") //read your Property Key
private String IntervalTimeInMin; //Store in this Variable.
//hello
#Value("${anotherProperty}") //readd another Property Key
private String anotherProperty; //Store in this Variable.
For more assistence you can refer this Link Here

How to call a method from property file using Java and Selenium WebDriver?

Currently Working on Selenium WebDriver and code I'm writing in Java.
I have created a MasterScript called Master.java which is the main script and it looks like this:
package test;
import org.openqa.selenium.WebDriver;
public class MasterScript {
public static void main(String[] args) throws Exception {
//*****************************************************
// Calling Methods
//*****************************************************
LoginOneReports utilObj = new LoginOneReports ();
WebDriver driver;
driver=utilObj.setUp();
if(utilObj.Login()){
System.out.println("Login sucessfully completed");
} else {
System.out.println("Login failed");
System.exit(0);
}
NewPR utilObj1 = new NewPR(driver); // instead of calling one PR it need to pick from the property file and it need to select the KPI in UI
if(utilObj1.test()){
System.out.println("NewPR KPI page has opened");
} else {
System.out.println("NewPR KPI not able to open");
}
FilterSection utilObj2 =new FilterSection(driver);
utilObj2.FilterMatching();
}
}
Put this dynamic values in the property file where each and every time it need to go to the property file and fetch the value, based on the value the related java file need to called.

Hi Just for example we will call the property file as setup.txt
say for example you have a url in ur setup file as "internal.url=https://google.com"
create a constructor
public MasterScript() throws IO Exception
{
setup_details();
}
public void setup_details()throws IOException{
FileInputStream inStream;
inStream = new FileInputStream(new File("Setupfiles\\setup.txt"));
Properties prop = new Properties();
prop.load(inStream);
internal_url=prop.getProperty("internal.url");
}
IN THE SETUP FILE*
internal.url=https://google.com
name the txt file as setup.txt
Now while using that in the main class u can just use "driver.get(internal_url);"
Hope This helps you...

Reading From Config File Outside Jar Java

Currently I am trying to read my config file from root of project directory, in order to make this actual configuration I want to move this to external location and then read from there.
Adding a complete path in following code throws out error :
package CopyEJ;
import java.util.Properties;
public class Config
{
Properties configFile;
public Config()
{
configFile = new java.util.Properties();
try {
// configFile.load(this.getClass().getClassLoader().getResourceAsStream("CopyEJ/config.properties"));
Error Statement ** configFile.load(this.getClass().getClassLoader().getResourceAsStream("C://EJ_Service//config.properties"));
}catch(Exception eta){
eta.printStackTrace();
}
}
public String getProperty(String key)
{
String value = this.configFile.getProperty(key);
return value;
}
}
Here's the error:
java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:365)
at java.util.Properties.load(Properties.java:293)
at CopyEJ.Config.<init>(Config.java:13)
at CopyEJ.CopyEJ.main(CopyEJ.java:22)
Exception in thread "main" java.lang.NullPointerException
at java.io.File.<init>(File.java:194)
at CopyEJ.CopyEJ.main(CopyEJ.java:48)
How can I fix this ?

The purpose of method getResourceAsStream is to open stream on some file, which exists inside your jar. If you know exact location of particular file, just open new FileInputStream.
I.e. your code should look like:
try (FileInputStream fis = new FileInputStream("C://EJ_Service//config.properties")) {
configFile.load(fis);
} catch(Exception eta){
eta.printStackTrace();
}

This line requires your config.properties to be in the java CLASSPATH
this.getClass().getClassLoader().getResourceAsStream("C://EJ_Service//config.properties")
When it is not, config.properties won't be accessible.
You can try some other alternative and use the configFile.load() function to read from.
One example would be:
InputStream inputStream = new FileInputStream(new File("C:/EJ_Service/config.properties"));
configFile.load(inputStream);

Loading a properties file from Java package

I need to read a properties files that's buried in my package structure in com.al.common.email.templates.
I've tried everything and I can't figure it out.
In the end, my code will be running in a servlet container, but I don't want to depend on the container for anything. I write JUnit test cases and it needs to work in both.

When loading the Properties from a Class in the package com.al.common.email.templates you can use
Properties prop = new Properties();
InputStream in = getClass().getResourceAsStream("foo.properties");
prop.load(in);
in.close();
(Add all the necessary exception handling).
If your class is not in that package, you need to aquire the InputStream slightly differently:
InputStream in =
getClass().getResourceAsStream("/com/al/common/email/templates/foo.properties");
Relative paths (those without a leading '/') in getResource()/getResourceAsStream() mean that the resource will be searched relative to the directory which represents the package the class is in.
Using java.lang.String.class.getResource("foo.txt") would search for the (inexistent) file /java/lang/String/foo.txt on the classpath.
Using an absolute path (one that starts with '/') means that the current package is ignored.

To add to Joachim Sauer's answer, if you ever need to do this in a static context, you can do something like the following:
static {
Properties prop = new Properties();
InputStream in = CurrentClassName.class.getResourceAsStream("foo.properties");
prop.load(in);
in.close()
}
(Exception handling elided, as before.)

The following two cases relate to loading a properties file from an example class named TestLoadProperties.
Case 1: Loading the properties file using ClassLoader
InputStream inputStream = TestLoadProperties.class.getClassLoader()
.getResourceAsStream("A.config");
properties.load(inputStream);
In this case the properties file must be in the root/src directory for successful loading.
Case 2: Loading the properties file without using ClassLoader
InputStream inputStream = getClass().getResourceAsStream("A.config");
properties.load(inputStream);
In this case the properties file must be in the same directory as the TestLoadProperties.class file for successful loading.
Note: TestLoadProperties.java and TestLoadProperties.class are two different files. The former, .java file, is usually found in a project's src/ directory, while the latter, .class file, is usually found in its bin/ directory.

public class Test{
static {
loadProperties();
}
static Properties prop;
private static void loadProperties() {
prop = new Properties();
InputStream in = Test.class
.getResourceAsStream("test.properties");
try {
prop.load(in);
in.close();
} catch (IOException e) {
e.printStackTrace();
}
}

public class ReadPropertyDemo {
public static void main(String[] args) {
Properties properties = new Properties();
try {
properties.load(new FileInputStream(
"com/technicalkeeda/demo/application.properties"));
System.out.println("Domain :- " + properties.getProperty("domain"));
System.out.println("Website Age :- "
+ properties.getProperty("website_age"));
System.out.println("Founder :- " + properties.getProperty("founder"));
// Display all the values in the form of key value
for (String key : properties.stringPropertyNames()) {
String value = properties.getProperty(key);
System.out.println("Key:- " + key + "Value:- " + value);
}
} catch (IOException e) {
System.out.println("Exception Occurred" + e.getMessage());
}
}
}

Assuming your using the Properties class, via its load method, and I guess you are using the ClassLoader getResourceAsStream to get the input stream.
How are you passing in the name, it seems it should be in this form: /com/al/common/email/templates/foo.properties

I managed to solve this issue with this call
Properties props = PropertiesUtil.loadProperties("whatever.properties");
Extra, you have to put your whatever.properties file in /src/main/resources

Nobody mentions the similar but even simpler solution than above with no need to deal with the package of the class. Assuming myfile.properties is in the classpath.
Properties properties = new Properties();
InputStream in = ClassLoader.getSystemResourceAsStream("myfile.properties");
properties.load(in);
in.close();
Enjoy

use the below code please :
Properties p = new Properties();
StringBuffer path = new StringBuffer("com/al/common/email/templates/");
path.append("foo.properties");
InputStream fs = getClass().getClassLoader()
.getResourceAsStream(path.toString());
if(fs == null){
System.err.println("Unable to load the properties file");
}
else{
try{
p.load(fs);
}
catch (IOException e) {
e.printStackTrace();
}
}

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reading properties file failure - java

I guess prop is not properly initialized in AppConfig. The NullPointerException may come from here.

Related

Relative path to file | Springboot

How to read Key - value pair from property file using annotations

How to call a method from property file using Java and Selenium WebDriver?

Reading From Config File Outside Jar Java

Loading a properties file from Java package

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