[jira] [Updated] (JDO-780) Potential NullPointerException in code
[
https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
XiangzheXu updated JDO-780:
---
Attachment: new-patch-for-jdo780.patch
> Potential NullPointerException in code
> --
>
> Key: JDO-780
> URL: https://issues.apache.org/jira/browse/JDO-780
> Project: JDO
> Issue Type: Bug
> Components: tck
>Affects Versions: JDO 3.2
>Reporter: XiangzheXu
>Assignee: Michael Bouschen
>Priority: Major
> Labels: NullPointerException
> Fix For: JDO 3.2
>
> Attachments: new-patch-for-jdo780.patch, patch-for-780.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> In class org.apache.jdo.exectck.Utilities, the method `printClasspath()`
> could throw an unexpected NullPointerException.
> The related part of that method is shown as follows.
> ```java
> public void printClasspath() {
> ClassLoader loader = ClassLoader.getSystemClassLoader();
> URL[] urls = ((URLClassLoader) loader).getURLs();
> }
> ```
> The invocation of `ClassLoader.getSystemClassLoader()` could return null in
> JDK 8, as is depicted in the Javadoc in its source code:
> @return The system ClassLoader for delegation, or
> null if none
> If that is the case, the invocation to `getURLs()` could cause a
> NullPointerException.
> Maybe we could check for null pointer here or mention the potential
> NullPointerException at the Javadoc?
--
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[jira] [Updated] (JDO-780) Potential NullPointerException in code
[
https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
XiangzheXu updated JDO-780:
---
Attachment: patch-for-780.patch
> Potential NullPointerException in code
> --
>
> Key: JDO-780
> URL: https://issues.apache.org/jira/browse/JDO-780
> Project: JDO
> Issue Type: Bug
> Components: tck
>Affects Versions: JDO 3.2
>Reporter: XiangzheXu
>Assignee: Michael Bouschen
>Priority: Major
> Labels: NullPointerException
> Fix For: JDO 3.2
>
> Attachments: patch-for-780.patch
>
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> In class org.apache.jdo.exectck.Utilities, the method `printClasspath()`
> could throw an unexpected NullPointerException.
> The related part of that method is shown as follows.
> ```java
> public void printClasspath() {
> ClassLoader loader = ClassLoader.getSystemClassLoader();
> URL[] urls = ((URLClassLoader) loader).getURLs();
> }
> ```
> The invocation of `ClassLoader.getSystemClassLoader()` could return null in
> JDK 8, as is depicted in the Javadoc in its source code:
> @return The system ClassLoader for delegation, or
> null if none
> If that is the case, the invocation to `getURLs()` could cause a
> NullPointerException.
> Maybe we could check for null pointer here or mention the potential
> NullPointerException at the Javadoc?
--
This message was sent by Atlassian Jira
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[jira] [Updated] (JDO-780) Potential NullPointerException in code
[
https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
XiangzheXu updated JDO-780:
---
Description:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The related part of that method is shown as follows.
```java
public void printClasspath() {
ClassLoader loader = ClassLoader.getSystemClassLoader();
URL[] urls = ((URLClassLoader) loader).getURLs();
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
was:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The related part of that method is shown as follows.
```java
public void printClasspath() {
ClassLoader loader = ClassLoader.getSystemClassLoader();
URL[] urls = ((URLClassLoader) loader).getURLs();
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
> Potential NullPointerException in code
> --
>
> Key: JDO-780
> URL: https://issues.apache.org/jira/browse/JDO-780
> Project: JDO
> Issue Type: Bug
>Affects Versions: JDO 3.2
>Reporter: XiangzheXu
>Priority: Major
> Labels: NullPointerException
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> In class org.apache.jdo.exectck.Utilities, the method `printClasspath()`
> could throw an unexpected NullPointerException.
> The related part of that method is shown as follows.
> ```java
> public void printClasspath() {
> ClassLoader loader = ClassLoader.getSystemClassLoader();
> URL[] urls = ((URLClassLoader) loader).getURLs();
> }
> ```
> The invocation of `ClassLoader.getSystemClassLoader()` could return null in
> JDK 8, as is depicted in the Javadoc in its source code:
> @return The system ClassLoader for delegation, or
> null if none
> If that is the case, the invocation to `getURLs()` could cause a
> NullPointerException.
> Maybe we could check for null pointer here or mention the potential
> NullPointerException at the Javadoc?
--
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[jira] [Updated] (JDO-780) Potential NullPointerException in code
[
https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
XiangzheXu updated JDO-780:
---
Description:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The related part of that method is shown as follows.
```java
public void printClasspath() {
ClassLoader loader = ClassLoader.getSystemClassLoader();
URL[] urls = ((URLClassLoader) loader).getURLs();
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
was:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The related part of that method is shown as follows.
```java
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
> Potential NullPointerException in code
> --
>
> Key: JDO-780
> URL: https://issues.apache.org/jira/browse/JDO-780
> Project: JDO
> Issue Type: Bug
>Affects Versions: JDO 3.2
>Reporter: XiangzheXu
>Priority: Major
> Labels: NullPointerException
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> In class org.apache.jdo.exectck.Utilities, the method `printClasspath()`
> could throw an unexpected NullPointerException.
> The related part of that method is shown as follows.
> ```java
> public void printClasspath() {
> ClassLoader loader = ClassLoader.getSystemClassLoader();
> URL[] urls = ((URLClassLoader) loader).getURLs();
> }
> ```
> The invocation of `ClassLoader.getSystemClassLoader()` could return null in
> JDK 8, as is depicted in the Javadoc in its source code:
> @return The system ClassLoader for delegation, or
> null if none
> If that is the case, the invocation to `getURLs()` could cause a
> NullPointerException.
> Maybe we could check for null pointer here or mention the potential
> NullPointerException at the Javadoc?
--
This message was sent by Atlassian Jira
(v8.3.2#803003)
[jira] [Updated] (JDO-780) Potential NullPointerException in code
[
https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
XiangzheXu updated JDO-780:
---
Description:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The related part of that method is shown as follows.
```java
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
was:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The related part of that method is shown as follows.
```java
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
> Potential NullPointerException in code
> --
>
> Key: JDO-780
> URL: https://issues.apache.org/jira/browse/JDO-780
> Project: JDO
> Issue Type: Bug
>Affects Versions: JDO 3.2
>Reporter: XiangzheXu
>Priority: Major
> Labels: NullPointerException
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> In class org.apache.jdo.exectck.Utilities, the method `printClasspath()`
> could throw an unexpected NullPointerException.
> The related part of that method is shown as follows.
> ```java
> public void printClasspath() {
> //Get the System Classloader
> ClassLoader loader = ClassLoader.getSystemClassLoader();
> //Get the URLs
> URL[] urls = ((URLClassLoader) loader).getURLs();
> }
> ```
> The invocation of `ClassLoader.getSystemClassLoader()` could return null in
> JDK 8, as is depicted in the Javadoc in its source code:
> @return The system ClassLoader for delegation, or
> null if none
> If that is the case, the invocation to `getURLs()` could cause a
> NullPointerException.
> Maybe we could check for null pointer here or mention the potential
> NullPointerException at the Javadoc?
--
This message was sent by Atlassian Jira
(v8.3.2#803003)
[jira] [Updated] (JDO-780) Potential NullPointerException in code
[
https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
XiangzheXu updated JDO-780:
---
Description:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The related part of that method is shown as follows.
```java
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
was:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The related part of that method is shown as follows.
```java
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
> Potential NullPointerException in code
> --
>
> Key: JDO-780
> URL: https://issues.apache.org/jira/browse/JDO-780
> Project: JDO
> Issue Type: Bug
>Affects Versions: JDO 3.2
>Reporter: XiangzheXu
>Priority: Major
> Labels: NullPointerException
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> In class org.apache.jdo.exectck.Utilities, the method `printClasspath()`
> could throw an unexpected NullPointerException.
> The related part of that method is shown as follows.
> ```java
> public void printClasspath() {
> //Get the System Classloader
> ClassLoader loader = ClassLoader.getSystemClassLoader();
> //Get the URLs
> URL[] urls = ((URLClassLoader) loader).getURLs();
> }
> ```
> The invocation of `ClassLoader.getSystemClassLoader()` could return null in
> JDK 8, as is depicted in the Javadoc in its source code:
> @return The system ClassLoader for delegation, or
> null if none
> If that is the case, the invocation to `getURLs()` could cause a
> NullPointerException.
> Maybe we could check for null pointer here or mention the potential
> NullPointerException at the Javadoc?
--
This message was sent by Atlassian Jira
(v8.3.2#803003)
[jira] [Updated] (JDO-780) Potential NullPointerException in code
[
https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
XiangzheXu updated JDO-780:
---
Description:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The related part of that method is shown as follows.
```java
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
was:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The method is shown as follows.
```java
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
..
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
> Potential NullPointerException in code
> --
>
> Key: JDO-780
> URL: https://issues.apache.org/jira/browse/JDO-780
> Project: JDO
> Issue Type: Bug
>Affects Versions: JDO 3.2
>Reporter: XiangzheXu
>Priority: Major
> Labels: NullPointerException
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> In class org.apache.jdo.exectck.Utilities, the method `printClasspath()`
> could throw an unexpected NullPointerException.
> The related part of that method is shown as follows.
> ```java
> public void printClasspath() {
> //Get the System Classloader
> ClassLoader loader = ClassLoader.getSystemClassLoader();
> //Get the URLs
> URL[] urls = ((URLClassLoader) loader).getURLs();
> }
> ```
> The invocation of `ClassLoader.getSystemClassLoader()` could return null in
> JDK 8, as is depicted in the Javadoc in its source code:
> @return The system ClassLoader for delegation, or
> null if none
> If that is the case, the invocation to `getURLs()` could cause a
> NullPointerException.
> Maybe we could check for null pointer here or mention the potential
> NullPointerException at the Javadoc?
--
This message was sent by Atlassian Jira
(v8.3.2#803003)
[jira] [Updated] (JDO-780) Potential NullPointerException in code
[
https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
XiangzheXu updated JDO-780:
---
Description:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The method is shown as follows.
```java
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
..
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
was:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The method is shown as follows.
```java
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
..
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
> Potential NullPointerException in code
> --
>
> Key: JDO-780
> URL: https://issues.apache.org/jira/browse/JDO-780
> Project: JDO
> Issue Type: Bug
>Affects Versions: JDO 3.2
>Reporter: XiangzheXu
>Priority: Major
> Labels: NullPointerException
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> In class org.apache.jdo.exectck.Utilities, the method `printClasspath()`
> could throw an unexpected NullPointerException.
> The method is shown as follows.
> ```java
> public void printClasspath() {
> //Get the System Classloader
> ClassLoader loader = ClassLoader.getSystemClassLoader();
> //Get the URLs
> URL[] urls = ((URLClassLoader) loader).getURLs();
> ..
> }
> ```
> The invocation of `ClassLoader.getSystemClassLoader()` could return null in
> JDK 8, as is depicted in the Javadoc in its source code:
> @return The system ClassLoader for delegation, or
> null if none
> If that is the case, the invocation to `getURLs()` could cause a
> NullPointerException.
> Maybe we could check for null pointer here or mention the potential
> NullPointerException at the Javadoc?
--
This message was sent by Atlassian Jira
(v8.3.2#803003)
[jira] [Updated] (JDO-780) Potential NullPointerException in code
[
https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
XiangzheXu updated JDO-780:
---
Description:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The method is shown as follows.
```java
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
..
}
```
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
was:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The method is shown as follows.
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
..
}
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
> Potential NullPointerException in code
> --
>
> Key: JDO-780
> URL: https://issues.apache.org/jira/browse/JDO-780
> Project: JDO
> Issue Type: Bug
>Affects Versions: JDO 3.2
>Reporter: XiangzheXu
>Priority: Major
> Labels: NullPointerException
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> In class org.apache.jdo.exectck.Utilities, the method `printClasspath()`
> could throw an unexpected NullPointerException.
> The method is shown as follows.
> ```java
> public void printClasspath() {
> //Get the System Classloader
> ClassLoader loader = ClassLoader.getSystemClassLoader();
> //Get the URLs
> URL[] urls = ((URLClassLoader) loader).getURLs();
> ..
> }
> ```
> The invocation of `ClassLoader.getSystemClassLoader()` could return null in
> JDK 8, as is depicted in the Javadoc in its source code:
> @return The system ClassLoader for delegation, or
> null if none
> If that is the case, the invocation to `getURLs()` could cause a
> NullPointerException.
> Maybe we could check for null pointer here or mention the potential
> NullPointerException at the Javadoc?
--
This message was sent by Atlassian Jira
(v8.3.2#803003)
[jira] [Updated] (JDO-780) Potential NullPointerException in code
[
https://issues.apache.org/jira/browse/JDO-780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
XiangzheXu updated JDO-780:
---
Description:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The method is shown as follows.
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
..
}
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
was:
In class org.apache.jdo.exectck.Utilities, the method `printClasspath()` could
throw an unexpected NullPointerException.
The method is shown as follows.
public void printClasspath() {
//Get the System Classloader
ClassLoader loader = ClassLoader.getSystemClassLoader();
//Get the URLs
URL[] urls = ((URLClassLoader) loader).getURLs();
..
}
The invocation of `ClassLoader.getSystemClassLoader()` could return null in JDK
8, as is depicted in the Javadoc in its source code:
@return The system ClassLoader for delegation, or
null if none
If that is the case, the invocation to `getURLs()` could cause a
NullPointerException.
Maybe we could check for null pointer here or mention the potential
NullPointerException at the Javadoc?
> Potential NullPointerException in code
> --
>
> Key: JDO-780
> URL: https://issues.apache.org/jira/browse/JDO-780
> Project: JDO
> Issue Type: Bug
>Affects Versions: JDO 3.2
>Reporter: XiangzheXu
>Priority: Major
> Labels: NullPointerException
> Original Estimate: 2h
> Remaining Estimate: 2h
>
> In class org.apache.jdo.exectck.Utilities, the method `printClasspath()`
> could throw an unexpected NullPointerException.
> The method is shown as follows.
> public void printClasspath() {
> //Get the System Classloader
> ClassLoader loader = ClassLoader.getSystemClassLoader();
> //Get the URLs
> URL[] urls = ((URLClassLoader) loader).getURLs();
> ..
> }
> The invocation of `ClassLoader.getSystemClassLoader()` could return null in
> JDK 8, as is depicted in the Javadoc in its source code:
> @return The system ClassLoader for delegation, or
> null if none
> If that is the case, the invocation to `getURLs()` could cause a
> NullPointerException.
> Maybe we could check for null pointer here or mention the potential
> NullPointerException at the Javadoc?
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