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Posted to user@jmeter.apache.org by Olivier Schmitt <ol...@agriculture.gouv.fr> on 2007/03/14 13:05:17 UTC
Parameter value corruption
Hi,
i'm using jmeter 2.2.
I try to record a test plan with the proxy server.
My web app uses JSF 1.1.
The view state is saved in HTML in hidden input control.
A view state is a tree of JSF component state saved as a gzipped base64 string :
...
ByteArrayOutputStream bos = new ByteArrayOutputStream();
if (compress) {
zos = new GZIPOutputStream(bos);
oos = new ObjectOutputStream(zos);
} else {
oos = new ObjectOutputStream(bos);
}
oos.writeObject(view.getStructure());
oos.writeObject(view.getState());
oos.close();
if (compress) {
zos.close();
}
bos.close();
hiddenField = " <input type=\"hidden\" name=\""
+ RIConstants.FACES_VIEW + "\"" + " value=\"" +
(new String(Base64.encode(bos.toByteArray()), "ISO-8859-1")) +
"\" />\n ";
...
sample :
H4sIAAAAAAAAAO19CXgcxZV/ayRZh2UsyZLlS/YQ29gGPDrm0OGQIMuyLVY+sM3...
When the current page is submitted by the browser, the proxy update the string into :
H4sIAAAAAAAAAO19CXgcxZV/ayRZh2UsyZLlS/YQ29gGPDrm0OGQIMuyLVY sM3...
the "+" char is missing at the end of the string !!!
So, JSF can not deserialized the string into objects : it crashes. (UTFDataFormatException, ZipException, ...)
I've remotly debugged jmeter to check when the value is altered.
When Proxy class record an HTTP request every parameter of the request is always decoded.
The HTTPArgument class is used to represent a request parameter.
public HTTPArgument(String name, String value, boolean alreadyEncoded) {
setAlwaysEncoded(true);
if (alreadyEncoded) {
try {
name = JOrphanUtils.decode(name, "UTF-8");
value = JOrphanUtils.decode(value, "UTF-8");
} catch (UnsupportedEncodingException e) {
// UTF-8 unsupported? You must be joking!
log.error("UTF-8 encoding not supported!");
throw new Error(e.toString());
}
}
setName(name);
setValue(value);
setMetaData("=");
}
At least every parameter value is decoded with URLDecoder.decode().
My parameter value is corrupted because of this call :
URLDecoder.decode("H4sIAAAAAAAAAO19CXgcxZVwz+iWZcuSJdv4HDDGds", "UTF-8")
returns H4sIAAAAAAAAAO19CXgcxZVwz iWZcuSJdv4HDDGds
Any idea ?
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Re: Parameter value corruption
Posted by Olivier Schmitt <ol...@agriculture.gouv.fr>.
A bug has been discovered by jmeter dev team, here :
http://issues.apache.org/bugzilla/show_bug.cgi?id=41837
This is a problem of form encoding. JMeter handles multipart form encoding badly.
Thanks for your help.
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Re: Parameter value corruption
Posted by Olivier Schmitt <ol...@agriculture.gouv.fr>.
I've checked again the behaviour of proxy.
Here is the stack trace :
HTTPArgument.<init>(String, String, boolean) line: 91
MultipartUrlConfig.addEncodedArgument(String, String) line: 96
MultipartUrlConfig.parseArguments(String) line: 127
HttpRequestHdr.createSampler() line: 243
HttpRequestHdr.getSampler() line: 182
Proxy.run() line: 104
The HTTPArgument constructor where decoding (corruption) is done :
public HTTPArgument(String name, String value, boolean alreadyEncoded) {
setAlwaysEncoded(true);
if (alreadyEncoded) {
try {
name = JOrphanUtils.decode(name, "UTF-8");
value = JOrphanUtils.decode(value, "UTF-8");
} catch (UnsupportedEncodingException e) {
// UTF-8 unsupported? You must be joking!
log.error("UTF-8 encoding not supported!");
throw new Error(e.toString());
}
}
setName(name);
setValue(value);
setMetaData("=");
}
As you can see in the following code, the method createSampler trigger the instianciation of HTTPArgument.
My value is corrupted before its used in GUI.
public HTTPSamplerBase getSampler() throws MalformedURLException, IOException, ProtocolException {
// Damn! A whole new GUI just to instantiate a test element?
// Isn't there a beter way?
HttpTestSampleGui tempGui = new HttpTestSampleGui();
HTTPSamplerBase result = createSampler();
tempGui.configure(result);
tempGui.modifyTestElement(result);
result.setFollowRedirects(false);
result.setUseKeepAlive(true);
return result;
}
>
> Regardless of whether the JMeter proxy records the session correctly,
> to be useful, the test plan must be runnable independently.
>
A sample of what kind of parameter i get with JSF :
agriForm:_idcl:agriForm=oid102panelcommand
agriForm:oid97value=25 RUE DES POTELOTS
agriForm:oid94value=3
agriForm:nomvalue=ALCIBIADE
com.sun.faces.VIEW:H4sIAAAAAAAAAO19CXgcxZVwz iWZcuSJdv4HDDGdsCjYy7JJgFZlm0R
YgtO4A3QGumJbUZTY96emQ5ByEJR5Ldb5MQsknISU4cyAUhu/8m2RwmgUBOIAkhF7u5gHBfyS7Z8Nd7fVX3VM90z0wL4pW z V53dWvq169q169qr7pUa4uJ3OhpDQVzuUz4XE
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agriForm:oid98value=
agriForm:oid95value=on
agriForm:oid92value=2
> Therefore, you need to check that the viewstate can be captured OK in
> a variable, and when the variable is used as the value in the HTTP
> parameter section that is sent correctly.
A test plan variable or a java variable ?
If you're talking about a test plan variable, i imagine the process is :
- do not use the proxy
- parse the HTML to extract the viewid string into a variable
- submit the extracted value
But there is a major issue : i can't build test plans by hand, it's too complex and too long.
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Re: Parameter value corruption
Posted by sebb <se...@gmail.com>.
On 15/03/07, Olivier Schmitt <ol...@agriculture.gouv.fr> wrote:
> >
> >> The view string change for every page.
> >
> >
> > Which is why I asked if you could try a simple test to extract the
> > string and see if it works in the following page if you switch off
> > encoding.
>
> As far as i know, the proxy construct HTTPSampler inside the following code :
>
> public void run() {
> HttpRequestHdr request = new HttpRequestHdr();
> SampleResult result = null;
> HeaderManager headers = null;
>
> HTTPSamplerBase sampler = null;
> try {
> request.parse(new BufferedInputStream(clientSocket.getInputStream()));
>
> sampler = request.getSampler(); (*)
>
> /*
> * Create a Header Manager to ensure that the browsers headers are
> * captured and sent to the server
> */
> headers = request.getHeaderManager();
> sampler.setHeaderManager(headers);
> ...
>
> It seems the parameter is corrupted before the HTTP request is displayed in JMeter GUI (*).
> So, i don't understand how "switch off encoding" in JMeter GUI can possibly solve my problem.
Regardless of whether the JMeter proxy records the session correctly,
to be useful, the test plan must be runnable independently.
Therefore, you need to check that the viewstate can be captured OK in
a variable, and when the variable is used as the value in the HTTP
parameter section that is sent correctly.
> I will check again in debug mode to get the exact stack trace.
>
>
>
>
>
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Re: Parameter value corruption
Posted by Olivier Schmitt <ol...@agriculture.gouv.fr>.
>
>> The view string change for every page.
>
>
> Which is why I asked if you could try a simple test to extract the
> string and see if it works in the following page if you switch off
> encoding.
As far as i know, the proxy construct HTTPSampler inside the following code :
public void run() {
HttpRequestHdr request = new HttpRequestHdr();
SampleResult result = null;
HeaderManager headers = null;
HTTPSamplerBase sampler = null;
try {
request.parse(new BufferedInputStream(clientSocket.getInputStream()));
sampler = request.getSampler(); (*)
/*
* Create a Header Manager to ensure that the browsers headers are
* captured and sent to the server
*/
headers = request.getHeaderManager();
sampler.setHeaderManager(headers);
...
It seems the parameter is corrupted before the HTTP request is displayed in JMeter GUI (*).
So, i don't understand how "switch off encoding" in JMeter GUI can possibly solve my problem.
I will check again in debug mode to get the exact stack trace.
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Re: Parameter value corruption
Posted by sebb <se...@gmail.com>.
On 15/03/07, Olivier Schmitt <ol...@agriculture.gouv.fr> wrote:
>
>
> > You should be able to extract the base64 string from a page, and put
> > it in a variable.
>
>
> > If you then use that variable in a parameter, and disable encoding,
> > does that not work?
>
>
> I can't record my test plan properly.
Yes, I know.
> When the view string is corrupted , I can't go anywhere,
> every single click re-submit the form, the proxy re-corrupts
> the view string, JSF re-throws exception.
Yes.
> The view string change for every page.
Which is why I asked if you could try a simple test to extract the
string and see if it works in the following page if you switch off
encoding.
> My organization, 50 developers, use JMeter , we force them to use Jmeter : i would like to
> find a solution without any extra load for them.
Unless there is a public server we can test against that can be used
to demonstrate the same behaviour, it's not going to be easy fixing
this. We'll need some help from you.
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Re: Parameter value corruption
Posted by Olivier Schmitt <ol...@agriculture.gouv.fr>.
> You should be able to extract the base64 string from a page, and put
> it in a variable.
> If you then use that variable in a parameter, and disable encoding,
> does that not work?
I can't record my test plan properly.
When the view string is corrupted , I can't go anywhere,
every single click re-submit the form, the proxy re-corrupts
the view string, JSF re-throws exception.
The view string change for every page.
My organization, 50 developers, use JMeter , we force them to use Jmeter : i would like to
find a solution without any extra load for them.
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Re: Parameter value corruption
Posted by sebb <se...@gmail.com>.
You should be able to extract the base64 string from a page, and put
it in a variable.
If you then use that variable in a parameter, and disable encoding,
does that not work?
On 14/03/07, Olivier Schmitt <ol...@agriculture.gouv.fr> wrote:
> >
> >
> > Can you successfully send the parameters if you update the test plan
> > and set the "Encode" check-box off?
> >
> > I.e. can you manually make it work (without or after using the proxy
> > recorder)?
> >
>
> no.
> JSF needs the view state of the current component tree in current request.
> This view state is gzipped byte array encoded in Base64, so a human can not set this field
> by hand.
>
> JSF renders HTML by himself (computes name of input, ... ): input, links, ...
> You can not set the parameter names and values by hand.
>
>
>
>
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>
>
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Re: Parameter value corruption
Posted by Olivier Schmitt <ol...@agriculture.gouv.fr>.
>
>
> Can you successfully send the parameters if you update the test plan
> and set the "Encode" check-box off?
>
> I.e. can you manually make it work (without or after using the proxy
> recorder)?
>
no.
JSF needs the view state of the current component tree in current request.
This view state is gzipped byte array encoded in Base64, so a human can not set this field
by hand.
JSF renders HTML by himself (computes name of input, ... ): input, links, ...
You can not set the parameter names and values by hand.
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Re: Parameter value corruption
Posted by sebb <se...@gmail.com>.
On 14/03/07, Olivier Schmitt <ol...@agriculture.gouv.fr> wrote:
>
>
> > There are some problems with encoding/decoding which have yet to be
> > resolved.
> >
> > There may well be a Bugzilla issue for this particular problem; if so
> > feel free to add any new information to it.
> >
> > If not, please create a new Bugzilla issue with the details from this
> > e-mail.
> >
> > Thanks.
> >
> > Note that patches are of course welcome, but they must not break any
> > correct behaviour and/or functionality.
>
> This issue http://issues.apache.org/bugzilla/show_bug.cgi?id=38115 describes a bug on decode phase
> but i'm not sure my issue match this issue.
>
> I'm fully aware of that : i've patched jakarta slide last month because of a major failure.
> I must patch jmeter because we need it.
Can you successfully send the parameters if you update the test plan
and set the "Encode" check-box off?
I.e. can you manually make it work (without or after using the proxy recorder)?
> I know jmeter as an end user, and i don't want to break any correct behaviour.
> Please let me know if you have any clue about how to patch this behaviour.
>
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Re: Parameter value corruption
Posted by Olivier Schmitt <ol...@agriculture.gouv.fr>.
> There are some problems with encoding/decoding which have yet to be
> resolved.
>
> There may well be a Bugzilla issue for this particular problem; if so
> feel free to add any new information to it.
>
> If not, please create a new Bugzilla issue with the details from this
> e-mail.
>
> Thanks.
>
> Note that patches are of course welcome, but they must not break any
> correct behaviour and/or functionality.
This issue http://issues.apache.org/bugzilla/show_bug.cgi?id=38115 describes a bug on decode phase
but i'm not sure my issue match this issue.
I'm fully aware of that : i've patched jakarta slide last month because of a major failure.
I must patch jmeter because we need it.
I know jmeter as an end user, and i don't want to break any correct behaviour.
Please let me know if you have any clue about how to patch this behaviour.
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Re: Parameter value corruption
Posted by sebb <se...@gmail.com>.
There are some problems with encoding/decoding which have yet to be resolved.
There may well be a Bugzilla issue for this particular problem; if so
feel free to add any new information to it.
If not, please create a new Bugzilla issue with the details from this e-mail.
Thanks.
Note that patches are of course welcome, but they must not break any
correct behaviour and/or functionality.
On 14/03/07, Olivier Schmitt <ol...@agriculture.gouv.fr> wrote:
> Hi,
>
> i'm using jmeter 2.2.
> I try to record a test plan with the proxy server.
> My web app uses JSF 1.1.
> The view state is saved in HTML in hidden input control.
> A view state is a tree of JSF component state saved as a gzipped base64 string :
>
> ...
> ByteArrayOutputStream bos = new ByteArrayOutputStream();
> if (compress) {
> zos = new GZIPOutputStream(bos);
> oos = new ObjectOutputStream(zos);
> } else {
> oos = new ObjectOutputStream(bos);
> }
> oos.writeObject(view.getStructure());
> oos.writeObject(view.getState());
> oos.close();
> if (compress) {
> zos.close();
> }
> bos.close();
>
> hiddenField = " <input type=\"hidden\" name=\""
> + RIConstants.FACES_VIEW + "\"" + " value=\"" +
> (new String(Base64.encode(bos.toByteArray()), "ISO-8859-1")) +
> "\" />\n ";
>
> ...
>
> sample :
>
> H4sIAAAAAAAAAO19CXgcxZV/ayRZh2UsyZLlS/YQ29gGPDrm0OGQIMuyLVY+sM3...
>
> When the current page is submitted by the browser, the proxy update the string into :
>
> H4sIAAAAAAAAAO19CXgcxZV/ayRZh2UsyZLlS/YQ29gGPDrm0OGQIMuyLVY sM3...
>
> the "+" char is missing at the end of the string !!!
>
> So, JSF can not deserialized the string into objects : it crashes. (UTFDataFormatException, ZipException, ...)
>
> I've remotly debugged jmeter to check when the value is altered.
>
> When Proxy class record an HTTP request every parameter of the request is always decoded.
>
> The HTTPArgument class is used to represent a request parameter.
>
> public HTTPArgument(String name, String value, boolean alreadyEncoded) {
> setAlwaysEncoded(true);
> if (alreadyEncoded) {
> try {
> name = JOrphanUtils.decode(name, "UTF-8");
> value = JOrphanUtils.decode(value, "UTF-8");
> } catch (UnsupportedEncodingException e) {
> // UTF-8 unsupported? You must be joking!
> log.error("UTF-8 encoding not supported!");
> throw new Error(e.toString());
> }
> }
> setName(name);
> setValue(value);
> setMetaData("=");
> }
>
> At least every parameter value is decoded with URLDecoder.decode().
>
> My parameter value is corrupted because of this call :
>
> URLDecoder.decode("H4sIAAAAAAAAAO19CXgcxZVwz+iWZcuSJdv4HDDGds", "UTF-8")
>
> returns H4sIAAAAAAAAAO19CXgcxZVwz iWZcuSJdv4HDDGds
>
> Any idea ?
>
>
>
>
>
>
>
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>
>
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